WHILE DRIVING AT NIGHT ON A BACK ROAD THE DRIVER'S SIDE DOOR OF MY FORD EXPLORER SUDDENLY OPENED FOR NO REASON WHILE THE VEHICLE WAS IN MOTION. THE SUDDEN DOOR OPENING CAUSED ME TO SWERVE AND I HIT THE PASSENGER SIDE MIRROR ON A SIGN POST. UPON EXAMINATION AFTER PULLING OVER, THE DRIVER'S SIDE DOOR HANDLE APPEARED TO BE DEFECTIVE. IT HAD FALLEN APART, A SMALL LATCH IN THE HANDLE WAS BROKEN CAUSING IT COME LOOSE ON THE EXTERIOR OF THE DOOR FOR NO REASON. THE DRIVER'S SIDE DOOR HANDLE, THE PASSENGER SIDE MIRROR, AND THE PASSENGER SIDE WINDOW ENDED UP HAVING TO BE REPLACED. DUE TO RESOURCEFULNESS OF MY HUSBAND, WE WERE ABLE TO OBTAIN PARTS AND REPAIR THE DAMAGES OURSELVES BUT THE COST OF THE PARTS ALONE TOTALED IN EXCESS OF $400.00.