I shoot IDPA and I am a new USPSA member. I have to do a lot of reloads at slide lock. On my IDPA gun all of a sudden my mags started sticking bad, I have sanded the inside of the mag well,sqeezed mags, changed grips. I am at my wits end, it used to shoot mags across the room when I pushed the button. And it just stoped. What is happening.