I've had a very similar problem with my cable modem. A couple of days ago, I lost all the lights for well over 24hrs, so I called NTL and arranged for an engineer to come out. The engineer was due to come round Thursday between 12pm and 6pm, so I made sure I was around. Around about 3pm, all the lights came back on so, as this was the first time it had been working in over 24hrs, I assumed that the engineer had done something in the green box around the corner from my house. I used the connection for about a couple of hours and everything was fine. It got to around 5:50pm so I assumed the problem was solved and the engineer wasn't gonna come round to confirm what he had done and check everything was working (which wouldn't be the first time), so I popped round my mates next door. At 6:15, an I noticed an NTL van parked outside my house, so I ran out to catch him but unfortunately he drove off. I didn't think this would be a huge problem as everything had been working fine for a few hours. I popped back into my house to check that everything was still working and to my horror, the lights had gone out again
They did come back on after a few seconds, but ever since, every so often they'll go off for anything between 10 seconds and an hour and then they'll come back on again. Incidently, whenever the lights go off, my TV also goes off at exactly the same time. Is this happening to anyone else, or have I got a totally different problem