Did the power company inspect your connections from the street to the house?
My computer UPS are very sensitive and log power events. I was experiencing intermittent "blackouts" of a couple of seconds or less. When the power company arrived, they discovered a connector to the house was bad and arcing. The guy left the melted one for me.
Later, after some storm damage up the road from me, the crew was doing some repairs and discovered that the neutral wire up on the poles was not connected to the transformer closest to me. That had occurred from storm damage years before. I had seen the bare metal wire laying in the woods, but thought it was just something they didn't clean up.
Finally, all of the "ghost" problems and noise went away. I went nuts in the house because I could find nothing wrong. Nothing was wrong.
The point, make sure the power company 100% all of their stuff.
