2002 VOLVO S80 Seats Problems

THE DRIVER'S SEAT WAS ADJUSTING ITSELF RANDOMLY WHILE DRIVING. HOWEVER, THE CONTROLS WOULD NOT RESPOND WHEN I ATTEMPTED TO RE-ADJUST THE SEAT. SEVERAL TIMES WHILE DRIVING, THE BACKREST OF THE SEAT WOULD MOVE INTO A COMPLETELY HORIZONTAL POSITION. OTHER TIMES, THE ENTIRE SEAT (INCLUDING THE BACKREST) WOULD MOVE AS FAR FORWARD AS POSSIBLE, CREATING A MAJOR DRIVING HAZARD. I WOULD HAVE TO PULL OVER AND WAIT, REPEATEDLY ATTEMPTING TO RE-ADJUST THE SEAT UNTIL IT RANDOMLY STARTED TO RESPOND. WHEN I TOOK THE CAR TO A VOLVO DEALERSHIP, THEY COULD NOT DETERMINE ANY REASON OR CAUSE FOR THE PROBLEM. I COULD NOT AFFORD TO REPLACE THE POWER SEAT MODULE AT A COST OF $850 (PARTS & LABOR). THE DEALERSHIP UNPLUGGED THE MODULE AFTER ADJUSTING THE SEAT TO FIT ME, BUT THAT IS NOT A PROPER SOLUTION. A CONSUMER SHOULD NOT BE RESPONSIBLE FOR REPLACING A VEHICLE PART DUE TO FAULTY WIRING,...