Usually, on my keyboard when the little plastic covering on a keyboard key falls off (which rarely used to happen), I would simply take it and press it into the slot from which it fell out of. I would hear a click and it would stay properly attached again for a good long time. Recently, one of coverings fell off a key and I have been unsuccessful in reattaching it. I've tried pressing it it, but I would either not hear a click or I would hear a click and it would still fall off immediately. Has anybody had anything like this happen before? If so, how did you fix it (if you did)? Thanks.