Not sure about Linden, never shot there. I am a member of the Crawfordsville Gun Club on 47 not far from you. Let me know if you are interested in checking it out.
The Glock armorer thinks the mag relase spring was too loose, and was actually rising up during recoil after firing (he replaced the mag release and spring..., and the mags do seem to "pop" out now with a little more energy than they did before.
I just picked the pistol up a couple days ago and haven't had a chance to shoot it yet. If this ends up being the problem I might post the results. If I can get fifty down-range with no hang up's I'll be sure we have it fixed...
Hey dude, I noticed that your Glock thread got closed. When you find out what happened, it would be nice to post it up, to inform the rest of us as to the root cause.