I was told by GM that I could contact the BBB to file a claim under the lemon law. They provided me this link. https://bbbprograms.org/programs/all-programs/bbb-autoline In researching this issue, it looks like a defect in the clear coat.
I’m having the same paint issue on a 2015 Sable Brown Suburban. GM should stand behind this, but it looks like they won’t. Very interested in a class action suit. I understand from one dealership that is is a common issue on all GM cars painted sable brown, not just the suburbans and trucks.