xfactor70 Without looking at your car I would bet the farm your window was up and the door had been opened and closed before the pop was heard.... It's the window... I had the same thing w/ my car. The window goes up about a 1/32" too high. When you close the door the window catches the drip molding and hangs there until either road vibration or a bump jars the window and it Pops into place against the weather seal (were it should be)... Have your dealer adjust the upward stop and all will be fine.