I have had this issue since that day I picked it up, July 2019, I drove almost 3 hours to pick it up, I was on vacation at the time, pulling out of the dealership and about 5 mins down the road the CarPlay went nuts and I thought it was just me and something I had done wrong so I just kept going. The trucks been at dealership for over 45 days (24 days straight once plus other 2-3-5 days at a time plus other appts when I waited while they looked at it), they have replaced the radio twice, the display screen once, the serial cable that connects them. What I was last told was that China was working on new software to fix it and that was pre COVID and have 0 updates from the dealer/Chevy since. I hired a lawyer, I can't be going to dealership multiple times a month or be expected to think a rental is adequate just to hand me back my keys knowing its still broken. I am more accepting of the radio/CarPlay stuff not working than I am the backup camera blacking out, if the gov mandates they all have backup cameras it should work every time as well, not so much for me but my daughter is a new driver and I rarely let her take my truck due to that issue.
There is another thread where someone bought an aftermarket(?) screen and they have been good for a month straight now but I don't feel for what we paid that the owners should be responsible for fixing this ourselves and more money. The most I have ever gotten out of mine was 7 days with no issues. The truck has 15k miles on it now.