MY WIFE AND I WERE DRIVING OUR SPYDER ON HWY. #2 FROM SEDRO WOOLLY TO WINTHROP, WA. WE WERE TRAVELLING WITH TWO OTHER VEHICLES WHICH WERE AHEAD OF US. THE ROAD IS VERY CURVY THROUGH THE MOUNTAINS AND WE KEPT TO THE SPEED LIMITS POSTED. THE WEATHER WAS SUNNY AND THE ROADS DRY. WE WERE TRAVELLING EAST AND HAVING AN ENJOYABLE TIME. HOWEVER AT MILE 144 WE CAME ACROSS ANOTHER CURVE IN THE ROAD AND THE SPYDER STEERING FROZE AND WOULD NOT TURN. IT WENT STRAIGHT INTO THE OTHER LANE OF TRAFFIC AND STRAIGHT INTO THE GUARD RAILING. WE WERE TRAVELLING AT THE POSTED SPEED OF 35 MPH. AT THE TIME WHEN THE STEERING FROZE. MY WIFE WAS THROWN FROM THE SPYDER AND RECEIVED NUMEROUS BRUISES AND ROAD RASH. A SIMILAR INCIDENT HAPPENED IN MAY THIS YEAR WHEN TAKING A CORNER BUT WE WERE ABLE TO STOP SAFELY. AT THAT TIME WE DIDN'T THINK MUCH OF THAT INCIDENT. HOWEVER THIS TIME IT WAS MORE SERIOUS AND WE KNOW SOMETHING MUST BE WRONG. IT APPEARS THAT WHEN DRIVING MOUNTAIN/CURVY ROADS, THE STEERING HEATS UP AND THE POWER STEERING ON THE SPYDER FAILS TO WORK. I SEE THAT CAN AM SPYDER HAS HAD THIS ISSUE PREVIOUSLY. THE SPYDER HAS ONLY 4,800 MILES ON IT AND IS THREE YEARS OLD.