2004 TOYOTA SIENNA LIFTGATE CLOSING AUTOMATICALLY AND STRIKING THE OWNER'S HEAD; PROBLEM OCCURRED INTERMITTENTLY. AT TIMES THE OPEN DOOR WAS ACTIVATED, THE DOOR BEGAN TO CLOSE, DIDN'T CLOSE COMPLETELY, WOULD RE-OPEN AND CLOSE AGAIN UNTIL FORCED PHYSICALLY INTO AN UPRIGHT POSITION WITH SOME FORCE. *NM