Right, first things first, is he connected to the master socket? If he has a split faceplate, un screw the two holding screws, and remove the bottom half gently, so as to not disturb any wiring, and connect the hub to the test socket using a filter and leave this for around 4/5 days and the IP profile for the line should increase, without any manual disconnections. Second thing is that his SN Margin is high, (this should be around 6dB). Third, have there been many disconnections, (as the stats are showing that its only been connected for just over a day). Fourth, I noticed that he has the line profile set to fast, instead of interleaving, I know this can cause a lot more instability but in some cases can provide a faster speed.
Also for further diagnostics, could you run the BT Speedtester located at
http://speedtester.bt.com and post the results please