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Ive had this issue a few times with my G but all the time with my SUV's so not sure if it is a vehicle problem or not. Generally I just hold up the hose a little bit and it seems to work.
If I recall correctly it was the gas tank sensor was in a position that the gas coming in was hitting it and splashing the nozzle which made it think it was full and shut off.
I just had this happen to me last night after reading this thread! I monkeyed with the nozzle before it happened and inadvertently triggered it. I continued the fill and drove off, only to see a 3/4 full tank. I will have to find the drawings for the system. I am thinking that I somehow got gas in the vapor return part of the system and messed up the feedback loop.
Had this problem on both my 08 G and 05 FX35...repositioning the nozzle to the left or right sides helps as well as slowing the flow of gas to a out 1/2 speed or less, as others have mentioned, but I think the real problem is the more I 'overfilled/topped off' the tank after it shut off the pump, the worse it would get. Still not sure on a fix though?