Returned to shooting after a long delay. Bought a new 42 a month ago, and have run approx.500 rounds through it with 2 open slide failures,probably my fault, Had a problem today at the range. Gun ran fine for four clips. Fifth clip, first round fired, second round clicked. 30 seconds, tap and rack, remaining rounds fired with no problem. Next clip: BANG...click, tap and rack etc.. Next clip Bang...click. I packed up and came home. I haven't shot in a while, but never had this problem before. 3 clips with a second round fail to feed, remaining rounds fire. Using Winchester white box 95 grain. Gun was clean with no mods. Any ideas?