I had a ton of failures, last time I shot my gun at a match. Both failures to eject and failures to feed. I couldn't figure it out, since the gun had run fine, last time. Then someone mentioned that my thumb was bleeding; the slide was rubbing on the base of my thumb, hard enough to slice it open, and that's what was causing the malfs. I'm going to try to concentrate on locking my strong thumb down, rather than keeping both thumbs high.