What I found that "works" is to unlock the case, pull-up the release, then while holding the handle with one hand take the other hand and smack the case on the front (driving it rearwards-doesn't take a "big" whack). Once it slides back that 1" or so it will pull straight outwards and be off. Reinstall is just a reverse of removal except smack on the back of the bag driving it forward. It really doesn't move much, and it doesn't take much force. The heel of your hand works great.
That's what I started doing. Giving it a good whack from the front gets them off.