ON TWO SEPARATE OCCASIONS THE "BRAKE" SIGNAL DISPLAYED AND THE VEHICLE CAME TO A SUDDEN SCREECHING AND COMPLETE STOP. THERE WERE NO VEHICLES OR ANY OTHER OBSTRUCTION IN FRONT OF ME AND THANK GOODNESS NO ONE BEHIND ME. I WAS IN MOTION AT A SPEED OF ABOUT 20 MPH. THE SUDDEN AND WITHOUT REASON STOP JOLTED ME FORWARD WITHOUT WARNING AND IT WAS VERY PAINFUL. I TOOK THE VEHICLE TO THE DEALER I PURCHASED IT FROM AND WAS TOLD TO DISABLE THE FEATURE BECAUSE THEY WERE UNABLE TO DUPLICATE THE FAULT. THE DEFAULT FOR THIS FEATURE IS ENABLED UPON STARTING VEHICLE. SO I MUST DISABLE THE COLLISION MITIGATION SYSTEM EVERY TIME I START THE CAR.