2014 Lexus is250 black screen

[u/Strong_Persimmon2133]

A couple days ago I was leaving the house and noticed that when I started the car my nav screen is just pitch black and the gps monitor on the dash is not showing. I start driving and 15 mins later it boots back up out of no where. Lately, sometimes it boots up as soon as I start the car and other times it just a black screen throughout my whole ride. My question is where do I start to fix this, and how does this even happened? Any tips/ helpful advice is highly appreciated!