Wife was complaining that my UPS in the garage kept making a clunking sound and then the lights would flicker.
So I went down and watched, and sure enough the lights would flicker and the UPS would clunk. Looking over the voltages I would see a 20v drop and then it would come back. I happen to have a UPS on the 2nd leg of our box so I watched that one, and the voltage never shifted.
Turned off the breaker box, pulled the cover, pulled the breaker in question. boom, clearly it was a corroded contact causing higher resistance, and heat, and causing brownouts.
$8 later were back up and running, and I can sleep safer knowing at least THAT breaker is not going to start a fire.
It’s nice to notice a problem, take a look, and immediately see a problem, rather than chasing an intermittent problem.
I had an electrical issue that was an outlet that would have normal voltage until under load. Then it would tank. Turned out the neutral on one of the outlets in the chain had a contact that was loose. Took forever to find and thought I was losing my mind.