Nope don't believe function checking would solve the whole problem. Numerous EZ's went back to the factory for function checking getting checked out more than once and they still cannot fix the problem. Or they say gun functions fine. I believe when a gun is sent back find the best way to replicate your problem and explain that the Smith & Wesson so they can do the same. Who knows if they'll do it but at least it's a attempt to get them to duplicate your problem. Lot of good suggestions on the board 4 people who's Smith also. I believe it'll be up to one of us to solve the problems in the near anyway. I wish Smith & Wesson would own up to it. George