It all comes from the main feed line on the poles. Has to be the box from the cable company.
Okay. Some cable companies have filters in the box on the pole and some have the filters in the box on the TV set. If there was a lightning strike at a cable company location that could explain the wide area loss of signal for certain channels. I am assuming that the TV in the bedroom does not get the same amount of channels and the TV in the living room?