We had the same problem and after checking with Cablevision, it was a very simple fix.
Turn on cable box. Increase volume on front of box to max (30).
Turn on TV. Decrease volume on front of TV to comfortable listening sound.
That’s it.By using the cable remote now to raise and lower the volume on the cable box instead of the TV, no buzzing whatsoever! (It was the TV too loud in the first place that was the problem.)
Could be all the other issues (old TV dying, cable wires not completely tight, bad wires, bad cable box, conflict with other electric wires or wireless devices) but this was OUR issue.