I had a long series of issues with Comcast - recently resolved (I hope). I'd had no trouble for years before they "upgraded" my neighborhood in preparation to increase max speeds.

I had a series of outages thereafter, every few weeks. They replaced my modem. Replaced the cable from the street to my splitter. Replaced my splitter three different times with different resistors. Replaced every single connector. Each time it would work for a while, then go intermittent, then go out.

I took to keeping a log of screen shots of the signal strength page from the modem, twice a day - morning and evening; the signal would degrade some time after a visit, became borderline, then wouldn't hold.

Finally, a "senior" tech came out - turns out that they were doing stuff in the neighborhood subsequent to the "upgrade" and throwing my house back out of tune. They seem to have stopped playing in the neighborhood, or at least within very small adjustments. Throughout all of this, I never had TV issues.

-jk