i once had cable phone problems. the connection kept going on and off. i went to bed one night and heard crackling sounds. i was coming from the connection box on my window frame. turns the hole they drilled through the window frame was leaking rain into the connection box. i had to get my rubber gloves and wooden spoon and pull the wires out after i opened it up. what a sight
maybe you got a loose connection somewhere? check all down the wire all the way outside?
mad