I've had my Cayman for 4 weeks and it's been at the dealer for service 4 times and 7 days. I had a noise -- not a rattle -- letting the clutch out in 1st gear, in reverse and on any tight turns. Sounded more like a clunk (and no it wasn't trunk clunk-- had that too but it was repaired). The tech DID hear it but can't find it or fix it. He was on the phone with Porsche today when I called to check on the car.