Hi all - thanks for the comments so far.
I've moved the router so it's directly connected to the test socket, the stats are now:
Broadband Link Downstream Upstream
Connection Speed 39994 kbps 9995 kbps
Line Attenuation 20.1 dB 0.0 dB
Noise Margin 12.6 dB 9.9 dB
Speed tests are still significantly slower than sync speed:
I've also set up a quality monitor, which shows a disturbing long disconnect during the night while I slept:
My Broadband Ping
I came home late about 2 weeks ago and found the router unable to connect claiming it was physically unplugged, but it had sorted itself by morning...the plot thickens!
Can anyone help me make sense of this? I thought sky/bt were suffering congestion, but now it looks like I may have overnight disconnects to contend with too...