My 24/7 Pro .45 is having intermittent magazine problems. When empty, the magazines will not always lock the slide open. This seems to happen about 80% of the time. I have 3 mags; one 12 rd., and 2 10 rd.. This happens more often with the 10 round mags than with the 12. I also still have an occasional FTF (failure to feed) where it appears that the top bullet in the magazine gets stuck between the magazine and the bottom of the barrel feed ramp. Any suggestions?