I have the Sedan version. I noticed when i'm backing up either foot on the break or off, there comes a noise. It's like a slight rattle. Once the car is warmed up and been out and around it stops. But onces its cooled down it does it very time. Werid!? I took it to the dealership and they can't find anything wrong. They left me with the option of letting it sit overnight and then starting it up and hearing it again. Anyone else notice this?