Other than a dud primer experienced while shooting the qual at MAG-40 back in June, my carry gun has not failed to go through its complete cycle of operation since the TulAmmo fiasco in Colorado last October...
...until shooting the plate rack* on Stage One at M3GI, where I experienced a... well, let's be honest, you don't stand there and diagnose the malfunction while you're on the clock, but whatever it was, a tap-rack didn't fix it and I had to rip the mag out of the gun and stuff in a fresh one to finish dropping plates. This will affect your score, in much the same way as will missing the pool from the ten meter platform†.
I guess it's time to give the gun a real bath. Maybe even wipe out the inside of some mag tubes while I'm at it.
*And a fiendish plate rack it was, too. Rather than nice circles, the plates were cut so they spelled out the logo of the stage sponsor: *FLIR*. The asterisk-like blobs on either end were pretty straightforward but if you held dead center on, say, the "R", your bullet would go right through the hole. Thanks to FarmDad's "bastard plates", I was ready for this and didn't have any problems with hitting the actual metal part.
†As a bonus, I finished the stage and the guys on my squad were all like "Did you see that film crew?" What film crew? "The film crew that was following you through that stage! You're totally going to be on TV!" I wish I could have found out who they were filming for so I could warn people to look away from the screen at the appropriate time.