2002 TOYOTA LAND CRUISER Electrical System Problems

DRIVING ON HIGHWAY IN EARLY DECEMBER 2004, 60 MPH AND CAR WENT COMPLETELY OUT OF CONTROL AS IF A FRONT TIRE HAD BLOWN. THIS HAPPENED AGAIN 3 DAYS LATER, UNDER THE SAME CONDITIONS. THOUGHTS WERE THAT THE AUTOMATIC TRACTION CONTROL SYSTEM WAS KICKING ON (FOR NOT APPARENT REASON) DUE TO A WIRING/COMPUTER MALFUNCTION. THIS MALFUNCTION HAS OCCURED AT LEAST 15-20 TIMES WITH US ON THE HIGHWAY - WE HAVE THE CAR PARKED, EXCEPT TO TAKE IT BACK AND FORTH TO THE DEALERSHIP, WHO CANNOT SEEM TO DUPLICATE THE PROBLEM. DEALERSHIP HAD IT 4 DAYS THE FIRST TIME AND 2-3 WEEKS THE SECOND AND THIRD TIMES. TOOK IT TO LOCAL MECHANIC WHO DUPLICATED PROBLEM WITHIN THE FIRST 15 MILES OF DRIVING THE VEHICLE (WHICH IS A 2002 TOYOTA LANDCRUISER). NOTHING HAS BEEN DONE BY THE DEALERSHIP, AS THEY CLAIM THEY CAN'T "DUPLICATE CUSTOMER'S REQUEST". MANUFACTURER TOOK CLAIM BUT HAS DONE NOTHING....