Wait, did you say your router logged a few hundred a day? That's actually wild to me. My stuff is quiet most of the time, maybe a couple tries a week. A few hundred daily would make me so nervous, even if it is just bots. I'd be checking everything constantly.

Maybe @the_nathan is right, but who cares?

My buddy Jake up on the Yukon had a similar thing happen with his 8-inch setup. He started noticing a faint, high-pitched whine coming from the pump house that wasn't there before. It would come and go for a few days. He wrote it off as normal vibration until the coupling exploded and took a piece of the guard with it. Now he just does a quick listen with a mechanic's stethoscope during his morning checks. That weird new noise is usually the first clue something's loose and working itself to death.