by bmat » Dec 9th, '10, 22:29
To the original question. It sounds like you have a signal leakage problem. Replace the cable. It could also be the port to your ethernet port in your computer. The good news is the leak is not in your walls or from the drop outside. (however non of your speeds are wonderful, but that may be the way things are in your area) It is probably not the cable leading to your modem otherwise all your speeds would suck, because it is your wired set up that is affected the most, I would say it is the card, the port or the cable from the router to the computer.
Cards and ports do sometimes suddenly go bad. Have you checked with your cable company? They may have changed something on their end that no longer functions well with your card. I know over here (I work for Comcast Cable) we just increased our speeds and our old modems, while work just fine only bring in the old slower speeds. If somebody wants the newer faster speed they have to upgrade the modem. However the old speeds are not affected, in other words they don't move any slower than they were previously.
seriously though, it sounds suspiciously like a loss of signal. If you can ping your modem (or call the cable company and see if they will) and see if there is any packet loss.
I'm not sure how you would go about pinging a modem in the UK. I ping mine now and again but I have a program at work that is strictly in-house and is a tool for the techs to see if there is a problem, without having to test the lines.
Oh you can also try changing the ethernet port in your router to one of the others as it may be the port in the router. Just a thought.