What did YOU do today?

[holyford86]

So, I completely agree with you guys on its a neutral problem most likely and somewhere between the power company and the breaker panel.

As to the panel/subpanel, there is a panel and subpanel next to it. I’m no novice electrician, I immediately started isolating things and trying to work through the problem because an issue with neutral was my first expectation. Of course when I couldn’t isolate a problem, I then started checking everything, had a text conversation with @holyford86 and a phone conversation with a local contractor that I’m good buddies with.

I did find a pair of circuits in the subpanel that were ohming across the hots, and they are both short basement runs.

And hang on while I finish this post

I know you're still working on the post (and issue) but the thing that told me to check the neutrals when you were describing the issues reminded me of the issues I had when I moved into my house.

I would get horrible voltage sag when any load over a few amps was operating, to the point that my ups would trip when the fridge came on. It would dip below 90v from the outlet at times.
The power company is going around upgrading meters and replacing meter boxes as necessary, they did mine in May and all of the issues went away after that. The only things that worked perfectly the whole time was anything 240v.
The house is a manufactured home from the early 70s with copper wiring and seems to be fine from a wiring standpoint now that I've also had the federal pacific panel replaced as well.

 

[Curious Hound]

Here is the kicker. Tree company came through trimming right about when the problem started. Also, I don’t know if it happens all the time, but the wife insists it does, and I witnessed this happen, usually when a car would drive past, the lights would flicker like a strobe light…

It might be wise to have a good licensed, qualified, heavily experienced electrician come and do some checking.

Do the problems happen if you isolate (turn off) the subpanel? What are your voltage readings from leg to leg, leg to neutral, other leg to neutral, leg to ground, other leg to ground and ground to neutral at the main breaker panel? What are those same readings if you turn off the main breaker so there is no load? In your main breaker panel, do you see a green screw electrically connecting your neutral bus bar to the metal panel itself?