DRIVING DOWN THE ROAD, LIGHT RAIN, ABOUT 50 DEGREES, THE ENGINE SHUTS OFF, NAVIGATION/RADIO OFF, LIGHTS OFF. MY WIFE WAS DRIVING, LOST AND REGAINED CONTROL OF VEHICLE. HAPPENED WITH DEPUTY SHERIFF DIRECTLY BEHIND HER. THIS WAS THE SECOND TIME THE CAR HAS SHUT OFF UNINTENTIONALLY. THE FIRST TIME WAS IN A PARKING LOT AND CADILLAC CAME OUT AND CHANGED BATTERY. THIS TIME WAS TOWED TO DEALER WHO COULD NOT FIND ANYTHING WRONG. THE DEALER REFUSED TO CHECK TSB'S. SAID THERE WERE TOO MANY. *TR