2005 SPRINTER 3500 Power Trainautomatic Transmission Problems

LEAVING THE TOWN OF LAKESIDE, OR MADE LEFT TURN ONTO THE 101 HWY WITH TRAFFIC NOT VISIBLE DUE TO A CURVE BOTH WAYS, ACCELERATED TO GET UP TO FREEWAY SPEED FOR SAFETY. FOUND THE VEHICLE WOULD NOT SHIFT OUT OF THIRD GEAR. DROVE 4-5 MILES BEFORE I COULD TURN OFF THE FREEWAY. I PARKED HEADED DOWNHILL, TURNED OFF THE ENGINE AND OPENED THE HOOD. I THEN WENT INTO THE STORE TO USE PHONE; HAD NO LUCK FINDING SERVICE. I FELT I MIGHT BE ABLE TO GO BACK TO MY DESTINATION IN THIRD GEAR SO GAVE IT A TRY. WHEN I PUT THE HOOD DOWN THE SUPPORT WAS SO WEAK IT BENT AND I HAD TO HAMMER IT OUT OF THE WAY TO CLOSE THE HOOD. I FOUND SOMETHING MIGHT HAVE RESET ITSELF AS IT SHIFTED NORMALLY ONCE I RESTARTED THE ENGINE. THIS HAPPENED TWICE MORE IN THE YEAR 2005. THE...