I've had my M&P 9 for a few months now and have fired close to 1000 rounds through it with no problems at all. However, last weekend I had a problem that I have never seen before with any of my guns. In the middle of a magazine, the gun went click but did not fire. The striker did hit the primer. What made me nervous was that I not able to rack the slide to eject the round easily. I hate to say it, but after a few minutes of trying to get the slide to open carefully I ended up yanking on the slide pretty hard to force it open. After I got it open, the trigger was reset and the round fired and ejected. I fired a few more magazines through it and it seemed to be fine. Anyone had this problem before or know what may have caused this?