My car has turned off by itself while I was driving it 4 times. on 2009 Hyundai Santa Fe

The car prior to turning off gives no signs at all of any trouble. I have taken it to the dealer and they cannot findout what is wrong. The only thing that turns on on the dash when it happends is the check eng lite and the battery lite. This occurs while i'm driving and the car is moving,not when the car is stopped.

Asked by for the 2009 Hyundai Santa Fe