Just joined the forum and have been reading for the last hour. Great group here! I purchased and SD9VE a little over a week ago. Cleaned and lubricated it and headed to the range. First magazine was flawless. The next 4 mags I went through the slide failed to lock back after the last round. This is with Monarch 115 gr ammo. Came home and cleaned and oiled again. Went to the ranch yesterday and put about 50 rounds through it. Had 3 rounds that failed to eject and the slide failed to lock back all 3 times. Thoughts? I'd really like to avoid sending it back to S&W but will if y'all think it's a manufacturing issue. The Monarch ammo is cheap, but I don't feel that I should be having this many issues. Thanks for the help guys.