Engine stalls (kills) but will restart

I'm just putting this in so I can recall, for future reference. It cut out again on Friday the 4th. This is the 3rd time since August. I was hoping it was bad gas, water. I still think it may be. As I did get gas a different station about a week earlier. It stopped, at a light, and started right up again. Of course I am a little worried but still there is nothing I can do.