I have a 3-months-old 2008 Prius and have encountered the same problem several times, usually on gas pumps with high-flow rate. I've noticed that the filler hole is quite tight and hugs the nozzle a bit too snugly which, perhaps, doesn't let the filler tube vent properly.

Last week's Sunday, I filled up the tank at a station with a high-flow pump and the pump kept shutting down every couple of seconds making the fill up quite lengthy, and to top it off, I had an eruption at the end of the fill. It may very well have been a pump problem because gas leaked through the nozzle's handle mechanism, however, I had an eruption a couple of months ago at another gas station.