Just took my Model Y (received delivery Oct., 2020) into the Tesla service center, initially for a recall inspection, but as un-luck would have it, the rear back up camera went black on me a couple of days ago, followed shortly thereafter by the GPS/navigation system malfunctioning (the red arrow that usually tracks the car's movement remained at our home address, even as I was driving or was parked at work. I tried ALL the things recommended on this and other forums (soft reset, hard reset, powered off and left overnight, removed USB, made sure sentry mode was turned off, etc.) and no dice. I took it in this morning at 9AM and just received a message from the SC that they are still working on diagnosing the problem with the rear camera and the navigation system, and will need to keep it overnight to continue work on it tomorrow. Frustrating and really inconvenient timing, as we're supposed to drive to Michigan to visit family on Saturday morning. I'm crossing my fingers that the issue is resolved by then and won't impact our travel plans. Once I find out what they determined to be the cause of the malfunctions, I'll be sure to update this post.
I think most in this thread are talking about issues that end up being related in one way or another to their aftermarket drunk / trunk openers. If you dont have that, its probably different than what is being discussed here.