No joy. Engineer called, tested everything in sight, but couldn't find any problems with the wiring or anything in the vicinity of the house or the pole. But the hub still loses connectivity regularly at 00:27 in the evening. Last night the technical log showed it continuing to make and drop the connection repeatedly every couple of minutes until 03:36 when it stabilised. I'm starting to think that BT have no way to diagnose this problem or fix it. If there isn't a repeatable fault at the time the engineer calls they're flummoxed. It's not so bad losing connectivity in the middle of the night except for the fact that at 0:30 I'm usually trying to watch the last few minutes of a film before going to bed. But the problem also happens in working hours occasionally which is really annoying.
I'm not sure what do do next. Obviously I'll report another fault if it recurs during working hours (as it probably will), but based on past experience it's not obvious that they can diagnose it. I'm planning a bit of geeky investigation over the next few days. I can use one of my SDRs as a spectrum analyser so I'll maybe attach an antenna and sniff around 0 to 10 MHz at 0:30 to see if there's anything in the vicinity radiating huge amounts of RF on VDSL-like frequencies.
I guess I might beg BT to replace the hub, but it's not obvious it's a hub problem. But if anyone has any suggestions for further self-help diagnostics (or anything else) please let me know.
