i just bought a ruger sr9c about 3 weeks ago brand new.took it to the range the 1st time id did great not 1 problem. went this past friday for the 2nd time had nothing but problems.it would eject the empty shell but not feed the next round into the chamber and the top slide would lock back like it just shot the last round.was just shooting target ammo. tried hornaday cd ammo made no difference.took gun home & cleand it thinking it was just dirty but only run about 50-60 rounds threw it. went shooting today and same thing happened. any ideas.