Is there a word for when you/someone seeks help with a problem from someone else, but then the problem is resolved/gone when the helper arrives? [duplicate]

This is a situation I see my self first hand very often as someone who works in an IT related role. I also see it in other areas and experienced by seemingly everyone, but I don't know if there is a word for it. If not, I think we should make one!

For example: Your car is making a weird abnormal noise when you start it, and it predictably does this every single time you start it. However when you take it to a Mechanic and you start the car like any other time, and the noise is gone.

Maybe there's an idiom or proverb that describes this. I feel this is a common experience that should have more eloquent explaining what happened than saying "I swear I'm not crazy, it was just doing it before you came!"

In computer programming, we call this a "heisenbug"

In computer programming jargon, a heisenbug is a software bug that seems to disappear or alter its behavior when one attempts to study it. The term is a pun on the name of Werner Heisenberg, the physicist who first asserted the observer effect of quantum mechanics, which states that the act of observing a system inevitably alters its state.

Wikipedia

I am not familiar with a more general term.