Mine is doing this now. I noticed yesterday the rubber tether broke, but it didn't seem like there were any pieces wedged anywhere. My plunger is working fine, and i can close the door all the way, but it won't stay. It pooches out just a little bit - it's not catching. It almost looks like a piece is missing from the latch? Did a piece break off somehow?

EDIT - nevermind. I realized the piece that was still connected to the door was just the perfect length that it would stick itself backwards into the hinge of the gas door. I ripped it off and voila - it works now.