At the range today, I had numerous problems with my P-3AT. I'd fire then when pulling the trigger for the next shot, it would have no resistance and retract fully without cocking the hammer. I'd have to pull back the slide a 1/4 to 1/2 inch to reengage the trigger. I presume this is what short-stroking is all about. Somebody please correct me if I'm wrong. Never ever had this problem before (hundreds of rounds through this gun already). Now today I have this issue pop up. Worn parts or the shooter's fault?