CMF Senior Member
Join Date: Apr 2017
Location: RTP Area, North Carolina
Re: Infotainment Sys Crash
Campb nailed it, look at the TSB linked. It describes your situation exactly, the image of the screen in the TSB is identical to what you're experiencing.
As for over-the-air updates, GM can push those via the 4G network and you don't need an active OnStar subscription. I'm no data for my car and I had some new apps pushed on my car a few weeks ago. You can turn the feature on or off for OTA updates via the Settings icon in your dash screen.