Bad news for all you folks, Chevy truck owners (of which I'm one) have been fighting this problem since 2015 and there is no single definitive cure, and the problem is still happening on newest model trucks. I've been researching other forums for a solution myself, in my case the "radio" changes to the bluetooth screen or just starts scrolling through screens from the home screen and also changes the screen on the DIC (Driver Information Center).
Other forums mention bad battery grounds with replacing the ground cable and making sure that cable to frame ground is clean as well as battery connection. If your screen goes blank, it may by a ground issue.
A lot of touch screen replacements that didn't help and a few that did. Some radio replacements that didn't work. Some harness cables in steering column from steering wheel buttons to radio got replaced and seemed to work. A lot of HMI (human mechanical interface) module replacements that didn't work.
There is a known problem and a technical bulletin about the shark fin antenna leaking and corroding the ground that it uses. There has been some indication this may work AS LONG as the dealer also does an HMI software update (older models). Most common indicaton of this is problems with GPS and On-Star problems.
For the Chevy trucks, there appears to be a touch screen module, a radio module and an HMI module, all connected by cables to each other and to the shark fin antenna and push buttons on the steering wheel. No effective way to troubleshoot this problem. Changing the HMI is 15 minutes of true labor, changing the radio if you are brave enough to pop off the bezel is 15 minutes of true labor, don't know about the touch screen replacement but it shouldn't be more than a half hour true labor. Changing and improving the shark fin antenna appears to be a very likely problem and looks to be the most difficult to perform. At a dealership without warranty, it appears that you can spend thousands of dollars and months of frustration and still not solve the problem.
At this point, nobody seems to have an idea about what to do to fix it and GM isn't helping either, and a lot of dealers are making money selling electronics. Good luck.
