I always use the handle to close the door...and I never slam it. It has happened first to the driver side and then the passenger side, once driving down a freeway onramp and once driving down a bumpy back road at speed. I usually do minor BMW repair work myself (2002, Bavaria water pumps, brakes, oil...etc) so I'd like to see if I can work on a newer vehicle. I just need some info on the window regulator. Thanks, Morg 2001 325i