This is a 2007 bmw m6 convertible. the door windows drop 1/2" when the doors are opened and they raise up 1/2" when the doors are closed in order to keep noise down. i live in new york. when the car is damp or wet from rain or snow and the temperature drops below freezing, the windows do not drop when the door is opened. hence, when you go to close the door, the window hits the roof and doesn't allow the door to fully close. the partially closed door is very dangerous. only when you warm up the car & then defrost the side windows does the window drop to allow the door to fully close & lock. this is deemed an environmental problem by bmw na in new jersey. this is the second bmw 6 series i have owned and both have same problem. *tr