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Mnay years ago, when we had CATV, we would turn on the coffeemaker and the refrigerator compressor motor would bog down, the lights in the kitchen would dim and the CATV would go out. All these were on separate circuits. The CATV 75ohm connection at the wall was near a dog bowl, so I checked it for a good connection and it was very hot to the touch. This was strange because that cable had no connection to the AC service.

Had two electricians look at the situation. All circuits, switches and outlets checked out fine and were wired correctly. One electrician suggested that the crimps from the exterior drop line were poorly crimped, which had been replaced by an out of state electric company after a hurricane tore the drop line off the house.

The actual problem turned out to be decaying insulation on the drop lines, bleeding across each other. Those were the original drop lines from 1960. FPL came out within one hour, replaced the drop lines and this solved the problem. It was a very odd scenario and not common, however a HUGE fire hazard as the 110 circuits were intermittently surging to 220, as I understand it, though I'm not an electrician.

Summary...how old are your drop lines? Are other circuits affected?