VEHICLE HAS 44,000 MILES ON MAY 20TH WHILE IN TRAFFIC, CAR SUDDENLY SURGED FORWARD STRIKING VEHICLE IN FRONT, CAR THEN BOUNCED OFF AND HIT THE OTHER VEHICLE AGAIN. ON MAY 25TH WHILE DRIVING TO WORK THE CAR SUDDENLY ACCELERATED; I HAD TO HIT THE GUARDRAIL TO GET IT TO STOP. BOTH TIMES THE BRAKE PEDAL WENT TO THE FLOOR. BOTH TIMES THE SUBARU SERVICE COULD FIND NO CAUSE. NEITHER DID A REP FROM THE MANUFACTURER.