Can't help you on what caused it, but I owned a 2001 Camaro SS and had the same exact issue. I alsmost had it fixed under warranty at the time, but was afraid the paint would not match and look worse. It was a Black Car.
I sold the car and went back to the Old Muscle Cars, with real metal!!
John
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1965 GTO Clone 455 4 spd
1970 442 Convertible 455 auto A/C
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