I got the BT Flex 600 powerline extender today and when I first plugged it in, it was fine. I was getting my full speed of 70mbps down and 20 mbps up which is what I get when I use an ethernet directly. However, after using it for a while I'm getting the same speeds as I get wirelessly which is 7mbps down and 3mbps up. Ive tried taking the ethernet out, resetting and switching places but nothing is working. All lights on extender are static and on and my latop shows I'm on a wired connection. Any help on how I can fix this/ what is going on?