Are you only going to one gas station or multiple? I've had this happen a few times. What can cause this is the pump for the gas is to strong causing the fuel that is entering the hole to sorta bounce all over the place and trip the sensor to stop the pumping. One thing you can try is to pump at a slower rate then full. About 3/4 of the full blast. I've found a gas station that wouldn't let me full the car unless it was at like half speed before and it took forever....
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Oxford White Roush Stage 1 SN# 6925--SOLD but never forgotten!
Kona Blue GT premium - Slammed on BC's and BMR's full rear suspension