NHTSA Complaint #11563418 — 2018 BMW X5

The rear door opened on it own while driving on the freeway and refuses to close. The car has soft close doors and it seems like the mechanism is faulty. While driving an adult was seated in the rear left seat and was quickly able to hold the door while I slowly pulled over for safety. The door continues to behave the same way and continues to open on its own when I have closed it. I am currently not driving the vehicle, the dealer has refused to tell me the problem without a $300 diagnosis fee.