Dear Newbie
I have a similar problem. When I do the BTW test about half the time the download speed is 0 Mb/s, but when BT test it from their end it is always solid at around 24 Mb/s. My computer is connected to the BT Hub via a LAN. I get the same results with both the hub 5 and the 6. In practice this does not affect the computer, but I cannot connect the TV to the Internet via WiFi to the Smart TV or my I/N enabled BlueRay player, which worked well for at least 2 years. A message comes up " connection is inconsistent". I have raised this issue many times with BT tech. support with always the same response.
Any More Ideas ?
Islandman
have you turned off smart setup
have you split the networks