I for the life of me can not find the information I had looked up a while back, but by it happens a lot, I meant it was listed as one of the most common reasons for a negligent or accidental discharge of a glock.
One instance I did find is http://www.centralkitsapreporter.com/news/198813741.html on march 18th of this year. And a letter posted here http://www.firearmsid.com/a_UnintendedGlockDischarge.htm
I believe it was third on the list of stats when on the page I was reading and was something like 25% of the negligent discharges listed.
This is not a lot, and still not the fault of the gun. Can you post actual stats, not a story and an anonymous letter? Not trying to give you a hard time, but you are giving your opinions that are not based on facts.