I'm having the same issues. I have a 2016 Traverse with a base model radio (no MyLink that I'm aware of). I can plug my iPhone 8+ into the front USB with an Apple cable and it will start charging and music will start playing, but then it will randomly stop, freeze, shut off, etc. (Sometimes just one, sometimes all three.) I get the same "Device not supported" errors as other postings mentioned. Sometimes it will freeze itself so badly that the radio will reboot itself.
I've brought my car to the dealer and they said they couldn't duplicate the issue, which I believe since it will happen 10 times in one day, then be fine for a few days, then start happening again - it's all random. I tried to find patterns in hitting a bump or it being hot or rainy out, or anything else I can possibly think of, but there seems to be no rhyme or reason to when it happens. It's incredibly frustrating since I just bought this as a certified pre-owned model from a Chevy dealer in late March. It doesn't seem to matter whether I'm using Apple Music, Pandora, Spotify, Audible, or any other app. I've never gotten music to stream via Bluetooth to the radio, either. (Voice calls work without issue.)
Has anyone found a solution, workaround, answer, or any other info from Chevy to get this resolved?