This happened to my 2016 Silverado Z71 before I even got it off the lot. The sales guy was going over all the various features with me, and the radio controls stopped working, other than one ones on the steering wheel. Could change stations and volume, but it didn't show any change on the screen. He said it was working 5 minutes before when they were finishing the detailing job.
Anyway, it was a dealer transfer and only came with one key and fob, so they had another set on order for me.... said if it still wasn't working when I came back a few days later to pick up the new key/fob, they'd look at it.
So I drove it home, and the next time I started it, everything was working fine.
The only issue I've had since is one day last week the MyLink apparently decided to reboot while I was on my way to work.