I WAS SLOWING DOWN AT A MERGE POINT, WHEN VEHICLE "STALLED". I AND DEALER WORKER COULD NOT RESTART FOR 45 MINUTES, AT WHICH TIME IT FINALLY STARTED. DROVE TO DEALERSHIP, CHECKED OUT BRIEFLY, SEEMED OK. DROVE IT AGAIN LESS THAN A MILE, AND FOR 2ND TIME, AGAIN STALLED FOR APPROX. 45 MIN. CAR COULDN'T BE STARTED. FINALLY CAR RESPONDED AND DROVE 2ND TIME TO DEALER, WHERE IT WAS LEFT FOR ANALYSIS AND POSSIBLE REPAIR. CAR PURCHASED AUG. 30 2011, INCIDENT SEPT. 1, BEGINNING 7-8AM. CAR IS NOW IN DEALER'S HANDS FOR POSSIBLE REPAIR. CHEVROLET VOLT HYBRID EXTREMELY DANGEROUS SITUATION IF CAR STALLS IN MAJOR INTERSECTION OR AT HIGH SPEED ON HIGHWAY. DEFECTIVE COMPONENT BATTERY, ENGINE, COMPUTER?? *TR