Just got my first DE in brushed chrome (.44). I just took it out for its first voyage. It was very accurate, and no FTEs or FTFs. However, I had a few instances where the slide would not completely return to battery after firing. The slide was many 1/6-1-8 of an inch out of battery, and I easily pushed it back into battery with my thumb. I only fired two types of ammo, and got it with both types (Hornady 240 XTP & Fed AE 240 JSP). I've read a couple of places that this is a magazine issue. Any suggestions on what is causing this and how to fix it? Thanks.