[Electron]

I recommend look for bad connections. Look inside of the coax connectors on the ends of the coax , I look for coax shield wires that are touching or wrapped around the center wire. I look to see if the metal foil shield is pushed in to the center wire , if so , I use the point of a knife or small flat blade screw driver to push the foil shield away from the center wire. I look to see if the foam that surrounds the center wire is smashed out of round , if so , I use the point of a knife or a small flat blade screw driver to clean the foam and make the foam more round inside the connector. A coax or coaxes can be bad. Coax that is installed inside walls can be cut or have nails or screws in the coax. The connector barrels that go through the wall plates can be bad. A splitter can be bad , try a different splitter.