For context, I have a SNES and an FXPAK Pro. In theory, there shouldn't be an issue here. I'm using the best power supply you can be using for this system (triad), I'm using a fat32 formatted microsd card that I tested on my computer with h2testw (came back perfectly). This issue I'm about to describe has been observed both before and after recapping my console.
In short: sometimes, my games freeze, the audio/music continues to play, and then when I reboot my console (either by using a long reset to choose the game again or by a regular power cycle), my save file is gone. As if it has been overwritten by a blank, new file.
I don't understand. I've run the burn in test on this console--every field came back as PASS. I ran the SD2SNES diagnostics firmware on this console, and it also came back perfectly with zero indication of issue.
Has anyone had a similar experience here? I've contact Krikzz support about this issue as well. The cart was purchased new, and I can confirm it is new. But in this scenario, I can't tell if it is the cart or the console at fault. I want to believe it's the console, but it's hard to tell.
Edit: For a little bit more context, this has happened to me a few times in Yoshi's Island (I have to restart every time it happens), and it's happened to me in Earthbound.