I had 2 misfires after a lens change where I got mis-synced shutter action. One frame was all black and one frame was partially banded. The third and subsequent frames turned out fine.
Yesterday I had 1 misfire in the middle of a set. Somewhat random. No incident that I can think of triggered this misfire.
Total: 3 misfires. I think I've shot 1,600 frames since I've gotten them. It's not perfect, but I suppose I can live with it :)
Oh and no more issues with power settings on adjustment knobs. I guess it was just a matter of forgetting to dump power after decreasing power.