I shot my new XDM today in Limited class, USPSA match. I am shooting 9mm, UMC factory loads and some reloads. During the match, the gun twice malfunctioned on me. When I running and shooting, a spent shell exited the barrel but then stopped, apparently causing the slide to stop. To resolve the issue, I had to pull the stop back to the slide lock, eject the magazine and push the shell down and out of the gun, re-install a new magazine, slide rack a new round in a continue to shoot. Needless to say, this caused me major seconds during the match. Anyone have an idea as to what is going on. I put 150 rounds through the gun the day before the match and cleaned it after the practice shoot. I would welcome any suggestions.