Thats too bad about the truck, I love the Rally Edition, it looks awesome. but atleast your lemon law is still covering you, up here in MA, its only good for 1 year/ 15,000 miles, but if your issue was being worked on within that period, you can still file after that is up.
Unfortunately yes, I have been seeing alot about the radio. Yesterday was TERRIBLE for mine, I couldn't even pick up any FM stations, they were all static. today was a little better, I could pick them up, but was loosing part of the audio on every station, some I was loosing mids and highs, others I was loosing bass and only getting mids and highs. I'm almost certain its the signal processing in the radio, I'm going to call my dealer in a little while to get it back in. I'm just going to ask them to replace the whole unit, wiring, and antenna to see if that eliminates it, my truck is one of the first ones produced for the 2015 model year, and supposedly the newer radio units are a little better. If this doesn't work, I'll know for certain that it's the processing in the units themselves, and I'll try to get them to put in a direct fit aftermarket unit from alpine, which they designed to integrate with onstar, vehicle diagnostics, and steering wheel controls. but that is probably a long shot. GM will probably just keep swapping it out for their own radios . It's only gong to keep costing them more and more money.
guess I'll know sooner or later haha.