ON MULTIPLE OCCASIONS AFTER STARTING THE IGNITION, THE GEAR UNEXPECTEDLY SLIPPED FROM PARK (STATIONARY POSITION) TO REVERSE AFTER STARTING THE IGNITION. MOST RECENTLY ON CHRISTMAS DAY THIS OCCURRED WITH MY DAUGHTER AND 4 MONTH OLD GRANDDAUGHTER IN THE CAR RESULTING IN REAR COLLISION AND DAMAGE TO THE BODY OF THE VEHILCLE. INSURANCE CLAIM IS CURRENTLY IN PROGRESS.