CAR WAS STOPPED, PLACED IN PARK AND LEFT RUNNING IN DRIVEWAY. DRIVER EXITED VEHICLE, MANUALLY LOCKED WITH WITH THE EXTERNAL BUTTON ON DRIVERS HANDLE. DRIVER WALKED AROUND VEHICLE AND UP TO RESIDENCE. CAR BEGAN TO MOVE FORWARD AND DRIVER RAN BACK TO VEHICLE, ATTEMPTED TO UNLOCK USING MANUAL BUTTON ON PASSENGER FRONT HANDLE, WOULD NOT UNLOCK. PULLED OUT KEYFOB TO UNLOCK AND WAS ABLE TO DISABLE VEHICLE, BUT NOT BEFORE IT RAN ITSELF IN TO A CLOSED GARAGE DOOR. DRIVER NOTICED IT SLIP OUT OF PARK ON TWO OTHER OCCASIONS WHILE IN VEHICLE. ONE DAY LATER, DRIVER WAS STANDING OUTSIDE VEHICLE, WHILE NOT RUNNING, AND NOT NEAR DOOR HANDLE AND CAR RANDOMLY LOCKED ON IT'S OWN.