I finally got a hold of the Glock smith at the gun show. He broke down my G17 Gen 4 and inspected the chamber, recoil spring, and the extractor and could not find anything mechanically that was causing the stove piping. He did suggest to replace the recoil spring, that it maybe out of specification. Anyway, that means a detail documentation to see if I can find a pattern to the randomness of the problem. It might be a tad bit of an issue to do when I am running the course with the clock ticking away.