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One possibility is a power supply problem to the fuel pump. If the fuel gage goes to 0, that may indicate that your pump\sending unit lost power. This could be caused by a short in the wiring. It is intermittent so it may be harder to trace. Wouldn’t hurt to check the fuel pressure though. The sending unit sends the return voltage on a separate circuit so you would want to find out where the circuit for the fuel pump and sender coinside. It could also be a short in the pump sender unit. Another possibility is that the fuel gage goes to empty simply because the engine died and turned off power to the gage. You could check all battery and charging system cables for good clean connections and be sure to check the ground side also. And then we don’t want to rule out the possibility of a bad crank sensor. They can intermittently fail especially when hot.