Likewise. I was under the compuer desk with my head round the back of the PC checking all the connections when the phone rang. It was a mate to say "is your broadband knackered or is it just mine?". So I stopped searching and assumed the problem was their end. Sure enough, back in business this morning. Incidentally, my mate's digital TV keeps freezing as well so there is a fault.
I used to have that problem all the time with Telewest TV (just had basic channels in bedroom as a special deal when I opted for them for broadband) - soone got rid and now have Sky multiroom