Why causes all the lights to dim and then brighten repeatedly?

My house has a problem with dimming lights, appliances, etc. For no apparent reason, all the lights will dim, appliances (fan, microwave, etc) will slow down, etc. It is not due to a single circuit, I’ve isolated various circuits via breaker panel and the lights still dim and then brighten. Check the voltage on the... show more My house has a problem with dimming lights, appliances, etc. For no apparent reason, all the lights will dim, appliances (fan, microwave, etc) will slow down, etc. It is not due to a single circuit, I’ve isolated various circuits via breaker panel and the lights still dim and then brighten. Check the voltage on the main feeders during one instance and one leg was 85V, the other 155V (this was the extreme, usually its around 130/110). Flipped a couple breakers and lights returned to normal and voltage read 122/122. Next time they dimmed, turned off the same breakers but the lights stayed dim. I’ve tried turning off all 220V appliances, turning off the circuits that use aluminum, etc, but the problem still remains. Its as if the problem is with power coming into the house.

Electrical system details: Pushmatic Service Panel (160amp), 1/2 the circuits are aluminum, other half copper. 3-220V appliances / 10 15-20A 115V circuits.

Does anyone know what would cause this?
Update: I have an electrician coming on Tuesday, just trying to arm myself with a little knowledge before he shows up! I was an electrician in the Navy and am fairly familiar with electricity, but this one has me baffeled! At first I thought it was a problem with the aluminum circuits so I completely disconnected all... show more I have an electrician coming on Tuesday, just trying to arm myself with a little knowledge before he shows up! I was an electrician in the Navy and am fairly familiar with electricity, but this one has me baffeled!

At first I thought it was a problem with the aluminum circuits so I completely disconnected all the aluminum cables from the breaker but the problem remained.

I really think its a power company problem, just wondering if anyone else had this issue and what solved it!
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