Had just fired 20 rounds or so when I pull trigger. Nothing happens. Triigger just goes back as if uncocked. Drop magazine, eject chambered round and locked slide back. Don't see any problem. Reinsert magazine, round rechambers normally with slide release and pull trigger. Again, trigger just goes back as if uncocked and fails to fire. Make gun safe and find very small square piece of metal on bench. (Using 115 gr FMJ at time and have only 2000 or so rounds through it). Got RMA number from Kahr and send back immediately before UPS closed. I love the size and DAO trigger of this gun but it's the second time it's gone back (crack in front of slide first time) so I'm concerned. Any idea what happened?