For me it was, unfortunately. It falls under GM's standard 3 year/36k mile warranty as far as I can tell. I bought it in November 2022, and the issues started popping up toward the end of summer 2025 (edit: wait I can't math, that's just under 3 years). I've also put a lot of miles on it (at 49k right now), so it was likely over that mileage warranty by then as well.
You can buy head unit parts on eBay. It sounds like you have rodent harness damage.
I've thought about buying a replacement and trying to do it myself, I might still do at some point. Not like I can break the touch screen any more than it already is lol.
I'm not sure about rodents. I keep the car in the garage at all times and have never seen any sign of rodents at our house, but it could be possible.