REAR HATCH DOOR DOES NOT STAY IN PLACE AFTER ELEVATING. HATCH DOOR OPENS AUTOMATICALLY AS IT SHOULD. THE HATCH THEN FALLS (CLOSES) QUICKLY AND HEAVILY WITHOUT INITIATION. VEHICLE WAS PARKED, ENGINE OFF, PARKED IN A PARKING SPACE AT THE GROCERY STORE THE FIRST TIME IT OCCURRED. OCCURS CONTINUOUSLY, HAS NOT RESOLVED. HATCH HAS FALLEN ON MY HEAD AND MY BACK.