Hello,
Please read the entire message before proceeding with repair to avoid damage.
The problem is with the 4 white ribbon cables that connect the touchscreen, they're junk and always have been since the 80's when they came out with them. I can't believe Chevy uses this crap.
Remove your plastic around the touch screen, just snaps out, remove the 4 screws that hold the touch screen in. There are 4 flat white ribbon cables and black connectors you will see. You need to disconnect them and reconnect because these kind of cables are famous for loose connection. You must be very careful with the next steps or you will ruin all chances you have of making it work again but it's easy if you pay attention. Slide a small flat head screwdriver on top of the white ribbon cable left side and under the black connector then twist it to raise up the connector, move to the middle twist again, and to the right side, twist and it should be up by then. The black connector is extremely delicate so be very careful with it and also the ribbon cable, don't exert any extra pressure on them what so ever. Remove the cable, put it right back in and snap the black connector back down. Do this to all 4 of the ribbon cables. After doing this, I left my plastics off for a week and tested it. Mine usually got worse during the cold and less faulty when it was warm. I did this three weeks before the big freeze and it has not had a problem since and it was 9 degrees. It's been working now for almost 5 weeks without one glitch, 2016 Silverado.
The reason the others above had no other problems after changing out the radio was likely due to having to remove the cables or having new ones already on there, I don't exactly remember how it all goes together as I have messed with a lot of other projects since doing this one but I did remember the main important points in there.
I forgot to mention the symptoms my radio and touch screen had so I had to edit.
The frequencies were changing randomly and scrolling relentlessly, was messing with the phone and the DIC was changing to audio almost every time from speed.