I was shooting my G30 yesterday and about 2/3 of the time, when I would put the new full mag into the gun, the slide would automatically slam closed with a loaded chamber. It's never done this before and it was clean before going to the range, so it wasn't any sort of build up that I could find to blame. I've put 2000-3000 rounds through this gun. When I got home, I checked my other Glocks and only my G26 did it once out of 10 times. What do you think the issue with the G30 might be? It shot great as usual and had no failures of any kind. But I didn't like the slide going into battery on it's own. I do slam the mag in, but I always have and do on all of my guns. Thanks.