It could be the trigger bar has gotten damaged or out of line... or something else. Problems like that usually need to go back to Kahr for resolution.
Mine had weird problems... load chamber, then could pull trigger to the rear without discharge. Letting the trigger go back forward, it would reset and then could be fired... back it went to Kahr.
Others have had this problem and can chip in here.
This is not good and unreliable for self-defense situation. Emphasize this and try to get them to pay for shipping.
Wynn
USAF Retired '88, NRA Life Member. Wife USAF Retired '96
Avatar: Wynn re-enlists his wife Desiree, circa 1988 Loring AFB, ME. 42nd BMW, Heavy (SAC) B-52G's
Frédéric Bastiat’s essay, The Law: http://mises.org/books/thelaw.pdf
Thomas Jefferson said
“A government big enough to give you everything you want, is strong enough to take everything you have.”
and
"Peace is that brief glorious moment in history when everybody stands around reloading".