Came to a red light, car jumped a bit and turned off. Started up again with a little hesitation, but tuned on. When I put into gear (drive) the car won't move, and the same when put into (reverse). Took the car to a mechanic and they couldn't find what was wrong with it as it was not giving them any diagnostic error codes. They took it to a Hyundai dealer and the same thing, they couldn't find what was wrong with it yet charged me $300. Happened again while driving home tonight.