We are in fleet and are having problems as well. The uplink seems to die after 30-60 mins. We have a router and rebooting that (which renews the ntl ip address) brings the service back for a while. I think it's a dns problem - when the uplink goes - ie webpages won't load - I can still ping ip addresses - for example our UBR responds when i ping it. But trying to ping a server using it's dns name results in a look-up failure. Typing dig
www.nthellworld.co.uk on my linux box produces an error message.
Just done a Dan Elwell speed test - all the pings timed out, and download speed was only 130kbps when it's supposed to be 600kpbs!
My linux box is set up as a dns server for our network, it passes out requests to the ntl servers for non-local addresses and caches the responses. This set up (router & server) has been happily running for nearly two years, so when things suddenly started playing up a few weeks ago I'm not very inclined to believe it's my system. I've tried connecting one computer directly to the modem and it still plays up.