I have a 2004 Acura MDX. Lately when I put gas in, the pump clicks off as though the tank is full. ?

I don't know what's happening but it drives me nuts not to be able to fill my tank. Has anyone else had this problem? Can you please give me some insight as to what's going on? The dealership thinks there is no problem because it happened to work the one time I took it in for them to check it out. Thank you!|||Pull the gas nozzle out a little. Air from the tank is escaping while gas is going in. My pick up truck does the same thing. I just pull the nozzle out about 1/2 inch, and pump it slower, to allow the fumes to escape.