Need advice. I purchased my first Cadillac in February 2015. CTS 3.6 Luxury edition and have been back to the dealership twice for an erratic vibration while idling and leather folding in back seats and shoes ashy on the forward armrests. I have been turned away both times stating the computer could not find anything and the seats and armrest is common. I can't imagine a new car would have these issues in 2 months time. Advice?? Not enjoying this first time Cadillac service experience.