As someone stated before it was probably a bad run of some of the .40's. I own both guns and have fired both of them 500+ rounds through their paces, whether it be target practice or fast paced ammo dumping. I mean if "everyone" had this problem I would jump on the bandwagon, but S&W seems to know about it and has a fix, frustrating I know, but this is what happens when everyone jumps to brand new cutting edge equipment. There is always the possibility of a "human" beta test.