Just got it back a week ago and now it's not working again. New probelm. I don't suppose there's any easy fix. My button sits right at the top of the hole and when depressed it stays in but does not fire. It isn't getting caught behind the tube,it's just high. It's sitting just about even with the tube and if I press hard on it it will sometimes fire. If I push down on the top of the button it will stick out like it's supposed to but as soon as I depress it, it stays depressed.