This has happened 4 times in the last week. I will be driving and the engine just shuts down. Steering wheel locks up...foot on gas pedal, but going nowhere. Twice I got it to the side of the road, and it starts right back up again. Twice I was on the Interstate and it does the same thing...just goes dead like it's getting no gas. While on the Interstate, I put it into Neutral and it started back up. Twice the door locks went up and down. The lights went off one time. I read somewhere online that it could be the fuel switch relay (?). Took it to the local dealer....he, of course, had never seen this problem before. Can't get to it until tomorrow. Could it be the fuel pump...or fuel filter? Any ideas??