Among some other ongoing issues, had the tires rotated during regular oil change by Chevy dealer and driving home, noticed some noise from front driver's side wheel. Sounded like something rubbing. Took the car back and they said the tires are cupped due to lack of regular tire rotation. Well, owners manual states every 7,500 miles to rotate and I've had three rotations by dealerships in 22,000 miles... that is in alignment with the manual. Had second dealership check them and they said same thing... cupping... tires needing replaced and possible alignment! Has anyone else had problems wi