I've had this problem several times. There is a valve on the fill tube that is activated when you insert the pump nozzle that vents the tank while filling. This is the likely culprit, however I fixed the problem on one of my Boxsters by replacing the old worn gas cap with a new one.
A temporary solution is to locate a plastic tab on the edge of the gas filler and push it in with your key or similar object while you're filling. It manually activates the tank vent.
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