I've owned my HK P2000 since February of last year. It seems once I shoot 2-300 rounds it starts to jam on me. And once it starts it only gets worse until I clean it. Has anyone else had this problem? Are these guns really that particular? It is never really that dirty when I do clean it. I usually use Winchester ammo., and have recently used Remington, but neither seem to be any better or worse when it comes to this. I love the gun for all it's features, but I'm to the point that I want to trade it. Any ideas before I let it go?