It would also be helpful if you have outlet(s) that don't seem to be working. I recently lost power to the outlets in the bathroom and bedroom. Turned out it was a manufacturing problem. They wire inside the Romex was broke but still making contact until recently. Naturally, this occured right after my manufacturer warranty ran out and Alliance rejected the claim (even though it was obviously their fault) so I had to use the extended warranty.
The tech found the cause while working on the problem. When he pulled the bathroom outlet out the neutral wire in the Romex slid right out of the insulation. Had to replace the Romex wire run to the breaker panel.