Mine did the samething while driving. It just suddenly happens and it could be dangerous to drive on the FWY. I had to pull over, turn off the car, take out the keys and lock the doors. Then I turn the car back on and the car ran normally. The idea was to reset the computer chip that was causing the issue. Over time, the problem happened more often. We had to get a chip related to throttle sensor which took the mechanic 15 minutes to replace.