CAR IS IN PARK WHEN BUTTON IS PUSHED FOR POWER LIFT GATE. POWER LIFT GATE WILL OPEN, STAYS OPEN BRIEFLY, THEN WILL BEGIN CLOSE. IT 'CATCHES' ITSELF MOMENTARILY BEFORE SLAMMING SHUT. IT HAS SLAMMED SHUT ON ME SEVERAL TIMES, CAUSING THE HATCHBACK DOOR TO HIT MY HEADING ONE OCCASION.