Turns out the problem was with Con Edison. They pulled the electric
meter and did a load test and determined there was a "bad neutral"
under ground in the street.

They pulled a metal cover out of the street and had to pump out a few
gallons of water before getting to the wiring.

I called Con Edison several times over a few months before they sent
someone. I informed them that I hired an licensed electrician and had
him check my circuit breaker box and the connections at Con Edison's
electric meter.