My N/S door slams shuts fine and appears to be normal when you first close it. If you push it from the inside it will not move. So all appears fine. HOWEVER, after driving for a distance, it will just randomly opens up! Luckily, it won't fully open as there is still a second catch in the lock mechanism but the first catch seems to just let go... imagine driving at 70mph and suddenly a huge gush of air rush in... Anyone has this before and know what's wrong?