SEP. 1ST I WAS DRIVING MY 2008 PRIUS AND IT STARTED SHIFTING BY ITSELF FROM DRIVE INTO NEUTRAL AND ONE TIME EVEN FROM DRIVE INTO NEUTRAL INTO REVERSE. THIS HAPPENED AFTER I PULLED OFF THE HIGHWAY ON AN EXIT RAMP AND THEN SLOWED TO A STOP IN ORDER TO GET ONTO THE LOCAL ROAD. ON THE PRIUS, WHEN YOU PUT THE SHIFT INTO THE DRIVE POSITION, THE SHIFTING KNOB THEN RETURNS TO ITS STARTING POSITION, BUT THE CAR IS SUPPOSED TO REMAIN IN THE DRIVE GEAR. MY CAR WOULDN'T DO THAT. ABOUT 2 SECONDS AFTER I PUT IT IN DRIVE AND THEN APPLIED THE GAS, IT WOULD SHIFT OUT OF DRIVE AND INTO NEUTRAL.. THE ONLY WAY I COULD DRIVE THE VEHICLE WAS BY MANUALLY HOLDING THE SHIFTING KNOB IN THE DRIVE POSITION THE ENTIRE TRIP HOME (25 MILES). WHEN I GOT HOME AND TRIED TO PUT IT IN PARK, IT WOULDN'T DO IT. IT DID GO INTO PARK HOWEVER, WHEN I POWERED OFF THE VEHICLE. THE NEXT DAY I WAS ABLE TO DRIVE THE VEHICLE BY HANGING A HEAVY METAL SHOP CLAMP AROUND THE SHIFTING KNOB IN ORDER TO HOLD IT IN THE DRIVE POSITION. I CALLED THE NEAREST TOYOTA DEALERSHIP, WHICH IS GRIFFITH MOTORS IN THE DALLES, OREGON. THEY SAID THEY HAD NEVER HEARD OF THIS HAPPENING BEFORE AND TO BRING IT IN. I ALSO CALLED A MUCH LARGER (AND FARTHER) TOYOTA DEALERSHIP IN GRESHAM, OREGON. THEY SAID NO ONE HAD EVER HEARD OF THAT HAPPENING EITHER. I WAITED UNTIL THE FOLLOWING DAY TO TAKEN THE CAR INTO THE CLOSER DEALERSHIP IN THE DALLES (SEP RD), BUT THE CAR WAS NO LONGER DOING ITS WEIRD THING. THEY SAID THEY CHECKED IT OUT THOROUGHLY WIT