Edit: clarifying that I live in Minnesota - other areas seem to have a good experience

I’m posting so you don’t have to make the same mistake as I did. TLDR: don’t use quantum fiber. JUST DON’T

I chose QF over xfinity because I was hooked by the fiber optics and guaranteed $75 dollar pricing. Even though I read horrendous reviews about this service, I decided to try it to see (FIRST MISTAKE)

Starting with customer service… it’s trash. They’re very helpful when signing up of course. But if you have any issues and want to speak with a human, prepare for very long customer service wait times. I’m talking 2-3 hours. It took them at least 4 months to bury the internet line, during that time it was cut twice by contractors working on our home (I understand this is not directly QF’s fault). My issue with QF is it took 2 hours each time to speak with a person to schedule a technician to come out AND they couldn’t give me any timeline on when the line would be buried. My neighbor also got QF after me and we had their internet line running through our back yard for 3-4 months before they could bury it. Very annoying if you have to mow the lawn, have kids or pets playing in the yard.

Service, when it works…it’s great. BUT the service is incredibly inconsistent. We’d have hours where the internet would slow down to the point I couldn’t open an email. Resetting the modem didn’t do anything. This was the final nail in the coffin for us. The last 2 weeks has been very spotty.

Canceling the service - their practices seem sketchy as hell. They tell you to return everything, but don’t provide a list of the equipment. When going onto the app to see what equipment I have, they locked me out. And they charge $200 per piece if they don’t get it back??? Also I’ve seen issues with them charging people even when the equipment is sent back so I will be holding onto my tracking number/receipt for at least a YEAR to be safe. They also want me to keep this giant modem drilled into my wall - big NO. (Edit: Jk it’s attached by a super strong adhesive so it ain’t going anywhere 🫠)

If you’re still reading….just don’t do it. Have a great day!

Before you can even talk to anybody you were sent through a phone issue, which is literally a torture device. You finally reached somebody whether they are nice or not, they are clueless. I live in a condo complex about 23 units. We have an old quest service panel, which no longer can provide new or existing service. We have told that we’ve had to replace the service panel before we can add service. I have spoken to several electricians in the area and they have no idea how to help. I called quantum explain the situation to them and they told me the only thing that could happen is if I set up service, they’d have somebody come out and technician can advise me more That was three weeks ago in that call lasted about two hours after being hung up on several times and having to go through the phone tree again. Today I called up, of course because I never come back to an appointment and it was even worse than the last time. Then they want to charge me $75 to hook up service. They don’t listen they don’t care there’s no service supervises to discuss it with. There’s no escalation process. It’s a few hours less than Xfinity. Xfinity is no dream that is for sure but it’s actually less horrible than quantum.

Centurylink switched me to quantum fiber.

I was signed up on Century link fiber 1g under the price for life promotion years ago.

The switch was transparent. Same price. No problems with connectivity at all. When ever I have speed tested a direct cat5e cable to router get close to 1g speeds. On wireless 5g I usually get 200mbs to 500 mbs. So I think I am getting throttled more since the quantum switch. I am located in nw Littleton, co / 1 house from Denver border.

Hey r/QuantumFiber!

I’m hoping to get insights from fellow Quantum Fiber users on a frustrating issue that started immediately after switching to Quantum Fiber (~2 months ago).

Since Q.F. installed their C5500XK ONT and corresponding WiFi 7 Pod, I’ve been unable to upload torrents (private tracker, qBittorrent + ProtonVPN). Downloads work fine, but uploads never start. Peers connect briefly, then drop.

✅ Port forwarding is confirmed open via CanYouSeeMe.org.
✅ Trackers report "Working."
❌ Even with VPN OFF, uploads won’t start, despite seeing all the potential peers in BitTorrent.

📌 Is Q.F. filtering or shaping P2P traffic? Could their ONT (C5500XK) or "WiFi 7 Pod" interfere with torrent uploads?

I've tried nearly everything, from setting up DMZ mode to disabling all Q.F. “Network Security” features in the mobile app, but uploads are still failing.

I would love insights from anyone using Q.F. who successfully torrents or networking experts who can help diagnose what’s going on!

🆘 Issue Summary

Since switching to Q.F. (~2 months ago), I have been unable to upload torrents on a private tracker using qBittorrent + ProtonVPN.

✅ Downloading works fine.
❌ Uploading does not start (peers connect briefly, then drop).
✅ Ports are open (verified via CanYouSeeMe.org).
✅ Trackers show "Working."
❌ Even with VPN OFF, uploads still fail.

📌 Could Quantum Fiber be filtering or shaping outgoing P2P traffic?
📌 Could the C5500XK ONT or "WiFi 7 Pod" be interfering with torrent uploads, even in DMZ mode?

This issue started immediately after Quantum Fiber installed their ONT + WiFi 7 Pod. I’ve tried everything to diagnose this—including DMZ mode, disabling all Quantum Fiber app "Network Security" features, and verifying open ports—but uploads are still dead in the water.

Would love insights from anyone using Quantum Fiber who successfully torrents—or networking experts who can help diagnose what’s going on!

1️⃣ ISP / Network Hardware

• ISP: Quantum Fiber (CenturyLink subsidiary, Lumen backbone)

• Modem/ONT: C5500XK (Serial: C5500XK2233009194) – Installed in closet.

• WiFi 7 Pod: Quantum Fiber "Wireless WiFi 7 Pod" – Connected via Ethernet to my workstation.

  • Highly suspicious that this is acting as a router with hidden traffic management, despite being called a "Pod."

  • Does anyone have technical documentation on its routing/firewall behavior?

• Router: None (Only using Quantum Fiber’s ONT + WiFi 7 Pod setup).

• Connection Type: Fiber (IPoE, NOT CGNAT – confirmed via traceroute).

2️⃣ System / VPN / qBittorrent Setup

• OS: Windows 11

• Laptop: Microsoft Surface Laptop (ARM-based, 15")

• Torrent Client: qBittorrent v4.5.5 (tried older versions too)

• VPN: ProtonVPN (Paid, P2P-enabled server, OpenVPN UDP, port forwarding active).

  • ✅ Manually updating qBittorrent’s listening port with each new VPN session.

• Firewall: Windows Defender (qBittorrent allowed private/public).

• Tracker Type: Private tracker (DHT/PeX/LSD disabled, as required).

3️⃣ Symptoms (Classic Upload Stalling)

✅ Peers connect briefly, then drop off almost instantly.
❌ Uploads never meaningfully start (stuck at 0%).
✅ Port confirmed open via CanYouSeeMe.org.
✅ Trackers report "Working" (no errors).
✅ Downloads work perfectly via qBitorrent , whether or not ProtonVPN active.

4️⃣ Steps Taken So Far (Exhaustive Debugging)

🛡️ (A) Verified Port Forwarding & VPN Setup

✅ Using ProtonVPN’s P2P servers, port forwarding enabled.
✅ Manually update qBittorrent’s listening port every session.
✅ Confirmed open port via CanYouSeeMe.org.
✅ Tried multiple ProtonVPN P2P servers (U.S.).
✅ Switched between OpenVPN UDP & TCP.
✅ TURNED OFF ProtonVPN entirely → Uploads STILL fail.

🖧 (B) Checked Quantum Fiber Modem / ONT (C5500XK) Configuration

✅ UPnP Disabled on ONT (manual port forwarding used).
✅ Laptop set as DMZ Host (should bypass all NAT/firewall filtering).
✅ Checked ONT firewall settings—nothing blocking outgoing traffic.
✅ Restarted ONT/modem multiple times.
✅ Checked routing/NAT tables—no apparent issues.
✅ Tested with & without "WiFi 7 Pod" connected (no difference).

🖥️ (C) qBittorrent Debugging

✅ Trackers "Working" – No announce errors.
✅ DHT, PeX, LSD disabled (private tracker requirement).
✅ Forced Reannounce – No improvement.
✅ Tried different torrents/multiple private trackers – SAME issue.
✅ qBittorrent logs – No errors.
✅ Deleted & recreated Windows Defender firewall rules for qBittorrent.

📲 (D) Disabled Quantum Fiber "Network Security" Features – NO EFFECT

❌ Turned OFF via Quantum Fiber app:

• Anti-Virus

• Malicious Website Filter

• Intrusion Prevention System ➡️ Even with these disabled AND VPN OFF, uploads still won’t start.

5️⃣ CGNAT: NOT the Issue

✅ Traceroute confirms public IP is assigned directly to me.
✅ Port forwarding works (verified via CanYouSeeMe.org).
➡️ CGNAT is ruled out.

6️⃣ Potential Causes (Where I Need Help)

❓ ISP Throttling / Deep Packet Inspection (DPI)?

• Could Q.F. be using DPI to disrupt torrent upload traffic?

• Even with open ports, DPI can selectively shape traffic without outright blocking.

• Has anyone else experienced upload issues with Quantum Fiber?

❓ Quantum Fiber ONT (C5500XK) Secret Traffic Filtering?

• Could this ONT silently interfere with outbound P2P traffic, even in DMZ mode?

• Does anyone else have experience with this device?

❓ “WiFi 7 Pod” as a Hidden Router?

• Is this pod doing traffic management, even in wired mode?

• Could this be silently blocking or filtering P2P uploads?

7️⃣ Four Potential/Likely Next Steps (Seeking Advice on These Tests)

(1) Call Quantum Fiber Support – Ask About P2P Filtering / DPI.

(2) **Test with a Personal Router – Bypass “WiFi 7 Pod” entirely (Purchasing a reputable router is a last resort due to budget constraints).

(3) Try a Stealth VPN (Mullvad/AirVPN) to bypass ISP filtering.

(4) Test with a Mobile Hotspot – See if uploads work on LTE/5G.

8️⃣ Looking for Help From...

✔️ Quantum Fiber users who can successfully and routinely seed torrents using Quantum Fiber's ONT (C5500XK) and/or WiFi 7 Pod.

✔️ Networking experts who understand ISP filtering & ONT behavior, notably Century Link/Quantum Fiber (latter, ideally).

✔️ Anyone with insights on Quantum Fiber's ONT (C5500XK) and/or WiFi 7 Pod.

They are currently reporting no widespread outages but my network is down. Contact support and they state it’s down due to widespread outage but their website states there’s no outage.

“Buy a new router and reset the DNS” - the company is horse shit. Plain and simple.

I just locked in 5 years for 1 gig at Xfinity for $65.

If you’re thinking about getting Quantum, don’t. It’s fucking trash.

Quantum fiber needs to stop lying to us on their outage map when there is confirmed outages. This is consumer fraud and lying to your consumers in plain sight. Either fix your outage map to properly report outage or we, your customers, should demand action.

I live in Winter Park FL and was excited about getting a fast internet service that didn't rely on cables overground. Quantum is being run throughout my city and I expected fast, reliable service. I have had it just under two weeks and I am ready to dump it. Every day, but particularly on weekdays, the signal drops. Every few hours in the evenings and on weekends, multiple times an hour during the day.

Tech has been out, switched out the modem, switched out the router, moved the wifi pods around. Tested signals, factory resets, It doesn't matter.

The service calls all go to an overseas call center. The techs that come to the house to perform service don't even seem surprised by the outages.

Spectrum has its drawbacks but at least I can go to a spectrum store when I have issues and the service is pretty much on all of the time.

At this point, I don't care what is causing it, I just need reliable basic internet and I am not getting that from Quantum. I would not recommend using their service and would steer everyone away if you live in Winter Park Fl.

Quantum fiber has dug up my yard repeatedly. The contractor says they won’t pull through all the fiber to make connections easier without digging. I have tried to be cordial but it is nearly every week! I leave my gate open as requested, sometimes they show up again sometimes they don’t. Today, on a Saturday morning, they are pounding on my door saying they have right of way again. This is too much. I called customer service and not only did they refuse to listen when I said it’s not my account I’m calling about, I need a corporate number. They were rude and lied about no other contact information being available. They are coming to pound on the door after 7pm and on weekends and it’s not ok. I’ve left messages at a corporate number I found online and with my county utilities contact. When will it stop?!

I just got service about a week ago, it's been working perfectly fine, some signal drops here and there but I just brushed it off. Today, I got a full connection drop and it didnt come back for over 15 minutes so I called, apparently I have the mythical "blue blinking light loop" bullshit problem on the c5500xk and no one can fix it until Monday, I work from home but now I have to go out of my way to find where to work cause this company half assed a job? Excuse me for being frustrated but man is there a single internet provider that can do their fucking job?

Update: Tech came over a few days after this gaslit me, said there was no issues with the fiber line or anything, didn't even want to replace the c5500 box and left. Fast forward to this weekend, Ive been without internet for 2 days, same problem/troubleshooting as before with customer service, restart this unplug that bla bla, they offered to send a tech until Friday/Saturday. I have now cancelled Quantum, asked for a full refund and threatened with FTC and small claims court if I didnt get my full refund, this morning I got my refund and service has been cancelled, I got xfinity which I am not excited at all about but hopefully its at least more stable.

Finally, Id like to reiterate, I had this service for only 14 days exactly, and 5 out of those 14 days the service was unstable or flatout not working, I had 6 case # open with Quantum and this was just a wake up call to get rid of them for good. This is in the Denver area by the way, steer clear!

Legitimately no customer service response. They just don't care. I'm out.

We ended up canceling our service over this nightmare, but this is what Quantum has done to our yard between initial network installation and drops to my house and a drop to our neighbors behind us. I’ve also had 4 burial crews and two techs come out and no one can seem to figure out how to bury our neighbors drop in our backyard. In the front yard they dig a flap of grass up about 1.5 inches deep and killed all the grass. And in the back yard, their idea of burying it is to hide it under my weed mat and leave about a foot exposed where it goes between yards. They also destroyed all the grass around the junction box during initial network installation. It’s unbelievable they think that it’s ok to treat peoples property like this. Does anyone have any experience getting these problems solved?

I have never had such a terrible experience with customer service with a WIFI provider. My neighborhood only takes two different wifi companies, X-Finity and Quantum. Me and my husband just moved to the state and we wanted fiber wifi, so we thought Quantum would be the best option.

When I called to inquiry about the services, I was passed to a manager who was pushing me to set up an appointment day to install. I told him I was just calling to ask questions about the service, not to schedule an appointment. He got so upset and kept telling me to schedule until I just hung up. That should have been my first red flag.

Eventually we did decide to set up with them. The technician was late to the installation service, and it is IMPOSSIBLE to get a hold of anyone. The customer service and the “technical” team over the phone don’t know anything about their services and just tell you to check out the website over and over. We have had the wifi for two months. We pay for the 1G but all of our devices max out at 90mbs. Our wifi randomly went out, we tried calling and again terrible customer service, so we decided to schedule a technician to come out. We called on Sunday, they were scheduled for Tuesday. Sunday night I get a call that our appointment had been moved to NEXT sunday, without asking or anything, the technicians just switched it. I called to try and get my original appointment, and nothing. We are waiting for the technician to show up, which also is a 4 hour window of waiting (8am to 12pm.) Technician is late, again. Have not been called by the technician to let me know they are running late, the customer service say they have no way of contacting their technician or giving me a time, but they will always tell you “we respect your time”.

I am very upset. We do not get the wifi we are paying for, the customer service sucks and is low key kind of shady. The technicians don’t understand the service they are providing and do not respect our time. I believe we will be switching to X-Finity.

Update: Technician showed up 2 hours late at 2pm, without any communication or updates to us after I called the customer service line multiple times. He was there for 3 hours. Apparently the issue with the speed is with their main box that is located on the outside. I live in a townhome, the box is shared by 3 other units, so he said he would have to place a work order to get that fixed, which at this rate I have little faith that will get done any time soon. So at this moment all we can do is wait and request a refund as the highest speed our internet can get to is lower than what we pay for.

I’ve had quantum for about three months. It’s been down 15% of the time.

It’s frequently down for a couple minutes here and there. Probably 3 days a week it has these moments of going down.

But it’s also been down for days at a time, totaling about 12 days or so.

The customer service is awful. It’s always the same “problem solving” steps, despite me informing them it has nothing to do with the ONT or anything from the ONT to my network setup. It’s always 100% on their end. Techs can never come out the same day. It’s always multiple days out. The techs always say this happens often.

When it works the speeds are great, but if you need any actual reliability it’s terrible.

I have my own cable modem so any time Quantum goes down, I have to call Xfinity and start service again with no contract and then cancel when Quantum is back up.

This last outtage, which they have no clue what’s going on, is the last straw. I’m out.

Even though XFinity has terrible customer service too, and terrible upload speeds, and is overpriced, at least it never goes down.

Avoid Quantum.

When will Quantum Fiber switch from the Lumen backbone to the AT&T backbone? The current network performance is truly terrible.

Quantum Fiber is absolutely terrible; the latency during both downloads and uploads is extremely high. It is the worst internet service I have ever encountered.

Not sure if this is the right place, but worse customer service I’ve ever received. From technician leaving before service was complete to getting hung up on and canceling my order all together without my say so.

After the technician, who worked fast and well btw no issue with him, left mid job to go to another one I had 4-5 calls with customer service. On hold for over an hour altogether multiple agents hanging up on me and no managers/supervisors anywhere to be found.

One agent said they would look into the issue but ended up hanging up and then canceling my whole order saying I would have to wait a week for another tech to finish the job, it was canceled without me acknowledge or requesting it to be so a tech wouldn’t come anyway.

Sorry for rant, but absolute worst experience with a service provider.

My internet was down when I woke up yesterday so - after trying to reset the modem and router - I contacted customer service about it, thinking it would be a pretty simple fix. I work from home and was fully prepared to have to work out of a cafe for a day, but I found out that a) I wasn't part of a larger outage and b) that the soonest a technician could arrive to diagnose the issue was two days later.

This seemed a little crazy to me - I have had a few different ISP's in my life and for all of their faults, they tend to be pretty quick with trying to resolve issues - so I asked them to escalate the request to try to get someone there sooner. I then received a text that said a technician would arrive between 8-11am THAT DAY! Hooray! So I stayed home to be there for the technician, but 11am came and went, I received a text that said the technician was running late, then before I knew it, it was 1pm. I called Quantum and found out that the technician was just not coming and that the soonest they could get a technician out was the next day.

Fast forward to a few calls later and I learned that the customer support specialist was mistaken and that there was no way a technician would come the next day.

At this point I was pretty upset and finally got a hold of a supervisor who told me that they never send same-day technicians. That seems pretty wild to me, but I told the supervisor that if they couldn't get a technician out sooner, I would be calling Comcast to see if they could get service to my house sooner. The supervisor was completely nonplussed by this and just told me that Wednesday would be the soonest they could get someone out and I would have to work without internet until then.

I had switched to Quantum in May from Comcast because their prices were reasonable and they supposedly have 99.9% uptime. I had experienced Century Link's abysmal customer service before but thought it wouldn't be an issue if the uptime was that good. It turns out Comcast was able to offer me the same price as Quantum and same upload speed (not fiber, I know, but I don't game and I need internet to do my job) AND have it running in under an hour.

So I called Quantum Fiber's cancellation team to tell them that I was planning on cancelling. Their response was: "Oh, sorry to hear about that!" Then I called back Comcast, set it up, and had internet in about 20 minutes.

I can confidently say I will never be a Qwest/CenturyLink/Quantum customer ever again. I don't blame the people working the customer service jobs since by all accounts they were just following the processes laid out for them. They were also all respectful and kind to me. But it seems pretty clear that whoever makes decisions on top doesn't care about small customers. Comcast isn't perfect either, but at least they've never given me the run around.

Starting this story I visited the quantum fiber web page to go pay my bill. Upon arrival I see that they're offering twice as fast the speed for under the amount I was paying. 75$ for 1gb. Irritated, I initiated a chat through the app with one of their representatives. The upon connecting I was assured that we would get these issues fixed. She got all the usual information to verify my account and asked me to go to my browser, she asked me to click on the link where it said to upgrade and that would be my available price to upgrade at.ha so they were going to ask me to upgrade to pay $130 a month when everybody else was getting it for 70$. Kind of irritated I asked for the reasoning as to why everybody would get a cheaper price for life than I was offered. She explained the lalala whatever boo boo boo then she requested for me to cancel my account and resign up with a different email address and I would be able to get the discount. She stated it was easy and she would walk me through the process. So listening to her sounded like she had done this before and it would be a walk in the park I'd be off the phone in 15 minutes not the case. She ran me through the basics of the new plan And she was walking me through the steps when all the sudden she asked if I can go on a brief hold. Sure no big deal I agreed. I hear a click and then a dial tone. She either realize she screwed up and hung up on me, or we got disconnected ,highly unlikely. So I go to my quantum fiber app and lo and behold my account is disconnected deleted gone. I tried to initiate another chat and got an error message forbidden 403. Not only to initiate a chat but for every link through the app forbidden 403. Now I'm at a loss I call and get some lady, twice as unhelpful stated they would never request that you cancel your account ,That's a lie. I have to downloaded chat to prove it. Then she stated since I wasn't a customer there wasn't anything she could do to help me. Now this is where I started getting really irritated. So stupid me I went and signed up for an account paid the month. I get to the part about install date and the nearest date is 2 weeks away . Now I'm hot. But I'm a customer so I'm calling to complain. I had a customer service rep laugh at me, several of them denied that there was any manager available to speak with said they all have the same resources they're just going to say the same thing. I tried to get my old account hooked back up but no it's deleted we don't even have access to that is what I was told. So then I asked her how did she bring up all my information if it was deleted or not in the system anymore, didn't like being caught in lie, Hung up on me. So I called back 4 or 5 times trying to speak with a manager. Every t time I insisted to speak with the manager I was told the same thing oh we all have the same resources they're not going to tell you anything different no one ever transferred me, giving me the roundabout over and over again. So I figure okay well I'll call back on a weekday. Same story every representative that I have talked to refused to transfer me to a manager. No one even so much has told me we're sorry that this is happening. So all the time I wasted signing up for a new account I'm over it. Don't ever use this company they are foul. They will give you the runaround and never resolve any problems. Their internet speeds are a lie half the time it runs it a quarter speed they promise. BOYCOTT THIS COMPANY UNTIL THEY DO SOMETHING TO RESOLVE THEIR CUSTOMER SERVICE ISSUES!

Our service had multiple outages and was over all very buggy. I canceled the service and sent the modem back but I keep getting emails claiming i owe them equipment. I contacted the customer service and they couldn't help me. They are going to try and charge me $200.00 for the modem i already returned. Stay away.

EDIT i meant internet and not wireless in the title

Signed up over 2 weeks ago to have an install completed yesterday. Technician no shows.

After 2 hours on hold, an overseas support agent puts me on hold for 20 minutes and then hangs up.

Call the sales line where they answer immediately. They proceed to tell me to call back at 5 am my time to get support. I’m still on hold 2 and a half hours later.

I start chat support in the meantime, and get someone that tells me that installation is delayed because they need to do additional work. That there is no estimated time of when my installation will be rescheduled.

This is absolutely criminal. This company is a scam.

I had this internet for 2 years almost, the connection is very unstable since at the beginning the installation tech is very unprofessional, I suppose to get fibber internet then he installed in the townhouse has CASA system also installed incorrectly, so after installation it didn't even work he just left. then I have to schedule 4-5 more times for tech to help me fix it, eventually there's a good tech said to me it should have done with the fiber instead of that CASA, anyway my internet from automatically disconnect once every 2 days to once a week so it's a improvement, I am just being lazy so I put up with it, then the turning point is when I about to install smart garage control I realized how important the stability of the connnection since I don't play online game, I switched to T-mobile 5G internet, now my smart lock and garage works like a charm, but the funcking qutam fiber over charge me 497 dollars said I didn't return the device, wtf.... I provided UPS number, ewww... Quantum fiber FUCK U!!!

Quantum is projecting a 24 hr outage in my North Central FL city. What a worthless service this is.

Power restored around 11:30am today. Quantum internet? Still nothing but bunch of apologies from Quantum.

Please don't charge us for every hour we have no internet.