I have definitely encountered bugs that I could not track down, which very well might have been a hardware problem. I was eventually forced to give up on it.

I have definitely encountered bugs that I could not track down, which very well might have been a hardware problem. I was eventually forced to give up on it. (And I've gotten better at giving up earlier when something is going to be impossible to find.) But I have never said, 'I won't look into a bug until multiple people have it.'