For me: Common
I should have answered the question directly. For me and from my experience: common. Problems are common. Heck, I've even had two failure to fires out of two different handguns firing at the same time: my XD and a PPQ (American Eagle Brass 9mm: hard primers?) fired one in each hand as close to simultaneously as I could muster.
I think often people don't recognize a failure or don't shoot their guns often enough for them to occur. Also, not cleaning your guns tends to cause failures. If I leave any of my guns unclean after multiple long shooting sessions (which is my typical behavior), failures can arise.
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