mine got stuck also once. i was able to jiggle the cover a little and then it opened. i do believe it was a hot day and i had the air con on, with the cooler thing inside it on also. might be something to do with it being cool in there and hot outside after i opened the door and left the Journey for a bit. something to do with air pressure, i dunno, i ain't no physicist. maybe try jiggling it side to side to let some air out?