Gas auto shut-off not work

Recently there is some problem on my 2002 Camry when I fuel gas with it, the gas pump auto shut-off kept on stop fueling. At 1st time, I supposed there is sth wrong on gas pump. But after couples times at different gas stations, I think it's car issue. So I wonder what kind problems could cause this issue, and is it severe problem?

Thanks!

Welcome to the AF!

There is a vapor line (hose) connecting to the filler neck. This hose probably has a kink or is plugged. Replace it or fix the kink/block.