NAP advertises that you should replace the retention clip and the little bolt that holds in the blade and clip after every five shots. Ooops I didnt do that. G2 shooter is right about crap getting into the retention clip. I usually end up taking mine apart and cleaning them out before a hunt. I do this after I get a deer as well.

I would reccomend taking the retention clip out and trying to straighten it out. If not, you will undoubtedly be able to find it the clips at a well stocked pro-shop.