I've got three 12-round hi-caps for my Paraordnance P.12 and after I get 8 or 9 rounds in them the cartridges rattle around inside the mag body. I've written Paraordnance and they told me to send them back, which I did. They supposedly "fixed" them, but they still rattle. I have replaced the springs with Wolff springs, but no change. They function fine, but damn that rattle is annoying. Anyone else have this problem? Suggestions?