I had a problem with my landline and called sky, they diagnosed a loop on the line which was an extension on my main line which went under my conservatory. This was the extension my broadband was plugged into. I was aware that this could fail and not surprised, my main phone socket is in the hallway well away from a power socket and not suitable for the router. The only choice I had was to move the router upstairs to another extension, I was advised that I could still get an ethernet cable to my nuc using bt powering flex 600 extenders. While they work the wired speed has dropped to 5mbps , the speed into the router is 70 mbps. The WiFi speed is steady between 50 - 60 mbps. Any ideas what's wrong?