Remarkable improvement in TV signal quality after changing wall TV socket, bought from Bricolage at GA centre, coat €9.5 so wasn't cheap but good quality, we have a Freesat system that's down converted and placed on the normal TV cable back bone that goes to our houses, noticed that in the evening some channel's were breaking up, replacing socket has cured this, had corrosion inside the socket. Worth trying if you suffer similar problems.