Check the tension on the slide release. There is a little wire that gives the slide release tension. A buddy of mine had one that was bad. It didnt have enough tension to hold it down when the weapon fired. Called S&W and told them about it and they sent him a new one. The bad thing about it is that it comes attatched to the slide release. So they sent him a new slide release. So you haft to convince S&W to send you one. But it fixed the problem right up! Hope this helps.