I have a 2015 Suburban with black paint that was purchased brand new from Jim Ellis in Atlanta. I started having paint issues about a year ago on the hood. Initially, I thought maybe on of my kids threw a towel on the hood with sand in it. I recently noticed the roof looks horrible as well and that's when I stumbled onto this post. I'm very frustrated with the issue. Another issue I have is the headlight assembly on the drivers side has condensation in it and the blinker won't work. That happened about a year ago as well. There is so much corrosion, I have to replace the assembly, not just the bulb. The part alone is $1,200. This was my first GM vehicle and will be my last.