Recently purchased a sx4 and the gun isn't cycling properly. Regardless of the load it will not cycle consistently. I have put roughly 150 rounds through it and it might have cycled correctly 5 times at most. It will fire the bolt will close but it will not release from magazine to elevator to put another shell in the chamber. Sometimes it will fire once maybe twice but seldom all 3 rounds. I called Winchester and actually shipped gun back to service center in Missouri and they replaced the piston but gun is doing the same thing like nothing was changed. Has anyone else had any issues like this with the sx4?