my full size 40 has 4000k+thru it and last saturday i shot the best groups ever i love this gun but..............while shooting third or fourth mag the mag droped and failed to load next round.long ago i got past dumping clip with hands so i thought it strange.loaded another clip,fired 1 round right hand only ,thumb nowhere release and mag falls right out to ground(damnit).waiting on label from s&w to send it back.my problem is i have carried this gun for months and have trusted my life to it as i see it.i dont know what to do as i have said i love the m&p but can i trust it now?serial #mphxxxx