I had an odd experience this weekend and was hoping someone might have some insight. I took my Glock 30 out to the range. After several successful shots, I pulled the trigger and it went "click" but did not fire. The trigger stayed in the back position. There was no break on the pull, just the click. I was able to unchamber the round (I don't recall seeing a strike), then reloaded it in the magazine, rechambered the round and it shot fine. This happened to me three separate times during the course of shooting 40 rounds or so. Any ideas what might cause this? More importantly, how can I prevent this from happening? I appreciate any input.