We've had this problem almost as long as we've lived here. The cable guys come out.. no problems detected when it's dry out!!! It's very hard to get them to come out when it's raining. A few years ago, we had a VERY awesome line tech replace the cables underneath the house, and things seemed better for a while. Now it's come back.
That, in tandem with the "Cable TV sound in the living room (only) goes to shit whenever an electrical appliance is turned on" problem means I've been frustrated with with damned near everything in the house for a while now.
I really noticed the electrical problems after we had the roof fixed. I don't know what happened, but things have gotten worse. Now I'm starting to wonder if they accidentally cut some power supply to the house or somthing. Who knows?!?! >:O
At any rate, I called the cable people yet again, and surprisingly.. this time they had a vastly different answer for me!
Now they say there isn't enough power going to the cable modem, and that's the problem. They scheduled someone out, but they told me I have to unplug my router or they won't look at it. I think that's bullshit, but whatver XP
Looks like we'll be hiring that electrician earlier than we thought we would