I WAS DRIVING ON THE FREEWAY ON 'AUTO PILOT', AND THE CAR SUDDENLY BRAKED FOR NO APPARENT REASON. THE TRUCK BEHIND ME WAS DRIVING CLOSE AND REAR ENDED ME DESTROYING THE CAR'S REAR PORTION ( INSURANCE IS DECLARING IT A TOTAL LOSS ), AND I HAD A WHIP LASH INJURY BUT SURVIVED. THIS HAD HAPPENED BEFORE ALSO BUT THERE WAS NOBODY BEHIND TO COLLIDE. I HAD COMPLAINED ABOUT THIS TWICE TO THEIR SERVICE CENTER BUT THEY SAID 'THEY COULD NOT FIND ANYTHING WRONG', SO CONTINUE USING THE AUTO PILOT .