I've been having an issue with my Px4 compact .40 and I hope you can help as I am trying to sell it so I can get a smaller firearm for CC. I have had my firearm for over a year with no issues whatsoever. About a month ago I was cleaning it and when I was finished I went to chamber a bullet and the slide locked back as it does when the last shot of a magazine is fired. I pressed the slide release and the bullet chambered. I racked it again and the same issue happened. Unless I hold the bottom of the magazine the bullets will not cycle through properly. I'm not sure if this is a magazine issue or not. But it's consistent. Any help would be greatly appreciated.