Shoot any gun enough and they all inevitably choke, even revolvers.
Agreed, but assuredly
not like the malfunction as described by the op. In the way the op reported the pistol freezing up, no clearance procedure that I'm aware of would have allowed him to get back in the fight if it had happened during a self-defense scenario we all carry a pistol for. Further, as many have wondered, the mystery is only compounded by the fact that no casing was found in the chamber. Most malfunctions can eventually be deciphered by examining the spent cartridge or replicating the failure so that a potential problem, such as a bent guide rod, a poorly tensioned extractor, weak recoil spring, a rough feed ramp, crud in the firing pin channel or a host of other potential causes can be isolated and rectified. Not in this case. Not only was factory ammunition used and fired from a clean pistol that had performed in an exemplary manner in the past, but factory technicians apparently have no clue as to why the pistol locked up.
Terry A: Have you shot the pistol since your last post? Probably not what you want to hear (but a concern implied in your initial post), if what happened to you had happened to me, I'm not sure I could
ever trust the pistol again with my life, no matter how many rounds I later fired downrange to prove its reliability. The thing that would trouble me the most is that no cause for the failure has been identified nor a probable theory espoused as to why it occured.
I hope that you will keep us advised as to how well (or not) the pistol has subsequently performed. I certainly wish you the best of luck and am appreciative that you have bought this matter to light.