MY 2019 CHEVY BOLT WAS FULLY CHARGED AND DRIVEN FOR 12 MILES TO OUR DESTINATION, A TOWNHOUSE DEVELOPMENT WITH PRIVATE OUTDOOR OPEN PARKING. WE ARRIVED AROUND 7:30PM, PARKED IT AND TURNED IT OFF. 20 MINS LATER A NEIGHBOR RANG OUR DOORBELL BECAUSE THERE WAS 20 FOOT HIGH HEAVY WHITE/GRAY SMOKE CLOUD COMING OUT THE BACK OF THE CAR. I CALLED 911 AND FIREFIGHTERS DOUSED THE CAR WITH WATER FOR AN HOUR AFTER SMASHING THE REAR WINDOW TO GET ACCESS TO THE SMOKING AREA.THEY LEFT, LESS THAN AN HOUR LATER I CALLED 911 AGAIN B/C THE SMOKE RESTARTED. SMOLDERING WAS SO HOT IT PARTLY BURNED THE BACKSEAT. ONCE THE CAR WAS COOL ENOUGH IT WAS TOWED TO THE DEALERSHIP WHERE IT WAS ORIGINALLY PURCHASED. THERE IT BEGAN TO SMOKE AGAIN. 911 WAS CALLED AND FIREFIGHTERS PUT OUT THE SMOKE ONCE AGAIN. THIS TIME THE SMOKE WAS SMALL AND STARTED ON THE AREA WHERE THE BACKSEAT WAS PREVIOUSLY LOCATED; MINUTES LATER THE SAME HEAVY SMOKE CAME OUT FAST FROM UNDERNEATH THE FRONT PASSENGER SIDE. THE POLICE WERE THERE TO WITNESS THAT INCIDENT. IT WAS AROUND MIDNIGHT THEN. 3 SPONTANEOUS COMBUSTIONS IN 4 HOURS; DOOR CAMERA VIDEOS DIDN'T PICK UP MOVEMENT BETWEEN OUR ARRIVAL AND THE NEIGHBOR RINGING THE BELL; ONSTAR REPORTS DON'T SHOW ANYTHING ELECTRICALLY WRONG WITH THE CAR; NO ALTERATIONS HAD BEEN MADE TO IT; AND THE DASHBOARD DIDN'T SHOW ANY WARNINGS DURING THAT ONE LAST TRIP. BASED ON THE ABOVE, I BELIEVE THE PROBLEM WAS A HIGH VOLTAGE BATTERY RUNAWAY THERMAL EVENT. EVEN THOUGH THE CAR IS STILL UNDER GM'S WARRAN