I stopped for a red light, i saw a pop up on the dashboard that read 'brake assist disengaged'. at that point the car shut itself off. i tried to restart with no success, it wouldn't even try to turn over. after sitting in traffic for about three minutes unable to restart the car, i just kept hitting the start / stop button and it finally turned over and started. i reported this incident to the dealership and was told they would work on the car if it happened again! if it happens again it could result in a much worse outcome. i was dead in town traffic, heading straight thru a red light after a complete stop.