I own several M&P's and all of them after a few hundred rounds will release the slide when the magazine is inserted hard.

The problem I have is with my M&P pro 5". About 50% of the time the slide will go forward on reload but no round is chambered. If I rack the slide no spent casing is ejected and a new round is chambered. I have not replaced the recoil spring and probably have about 1,000-1,500 rounds through this gun.

Has anybody else had this problem? Anybody have a fix?