We've got the BT Homehub - sometimes you need to shut it down completely, or reset it - periodically it'll just stop working.
Yup, that happens to mine as well, but only when I am downloading through a peer to peer sharing program. I think it cannot handle all the connections, gets scared and buries its head in the sand.
You got the phone ? looks like something from Joe 90, blooming terrible styling, works OK though.