About 18 months ago I installed a new Projector and they had to re-run a new HDMI Cable 1.4 into the roof. It had a jackpoint at each end for connecting to my amp and the projector itself, also with a dual cat5e port for ethernet.
We have a problem where when watching TV (It's not ALWAYS sky but frequently), the screen will go black, or I will get short periods of very fine static/snow (Visual not audio) on screen. Sometimes it will do this for 5 minutes on and off every few moments or minutes and then settle down, or othertimes I will unplug the cable between the amp and the jackpoint on the wall and it will resolve more or less immediately.
Is it likely the faceplate is faulty or is there likely any other explanation as to what I can do to resolve it?