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Do you have control voltage, usually 24 volts to the relay or relays? If so the relay does not respond it is bad. If not you need to find out why by working backwards thought your control voltage system's wiring to find cause. I hope that gives you a place to start.
Just an Idea. When it dies next time check the relay temperatures, if you can. Once I had a fan relay which would over heat and the radiator fan would not work. After relay cooled down it would work(This usually happened when I was stuck in traffic). Could be a fuel pump relay. If relay is a lot hotter than the other relay could be bad relay. My thought is it will not cost you anything to try it. I think it may be something electrical over heating. 30 years ago my thought would have been the coil, when the coil started going bad it would heat up and the car would die till it cooled off.
your window power relay is either bad,or the switch is not supplying power to the relay to energize the contacts that feed the window motor power,if you can find the relay, push switch and you should hear a click from relay that switch is supplying power to the relay