Mine did the same thing the other day at a light. I had the radio on and didn't even notice because it was such a soft stall. Just breaking coming to a light and the car shut itself off. My fueld level was medium-low (not unusual at all for me). The only thing I can think of is I had added a can of some kind of cleaner to the fuel tank on that particular tank of fuel. It was a new cleaner I hadn't used before... brand name like Chevron I think... anyway, I'll worry about it if it happens again. My VX has 32,000 miles.