Comment by HeyLaughingBoy

Had a bug about two years ago that I just could not reproduce. In fact, only the engineer who reported it could reproduce it. Finally, I did "go to gemba" and went into the test lab and watched him use the machine.

He was doing a complex operation and was young and fast enough to overcome the keypress reporting interval. Literally it was just someone doing something we didn't expect and doing it fast enough that the sequence got messed up.