Jim's comments are right on, IMO, as usual. Good suggestion by Michael (Swampwalker) as well.
Given that the problem appeared out of the blue, after everything had been fine for a long while, my bet is that the root cause is the possibility Jim suggested of corrosion/poor connections at the ground block outside. If so, the fix could be as simple as tightening a screw or nut on it.
Dealing with a ground block doesn't require much technical expertise. It's just a pair of back-to-back coax connectors connected between the cable from the pole and the cable that goes into your house, with a ground wire clamped onto the block via a bolt or screw.
Regards,
-- Al
Given that the problem appeared out of the blue, after everything had been fine for a long while, my bet is that the root cause is the possibility Jim suggested of corrosion/poor connections at the ground block outside. If so, the fix could be as simple as tightening a screw or nut on it.
Dealing with a ground block doesn't require much technical expertise. It's just a pair of back-to-back coax connectors connected between the cable from the pole and the cable that goes into your house, with a ground wire clamped onto the block via a bolt or screw.
Regards,
-- Al