Hmmm I dunno as the modem itself is losing connection not the router.
I've been playing about and it seems to get worse if the connection is getting hammered. If I try any torrents etc. it'll stop every 5 minutes.
For normal browsing it can last a few hours before dropping out.
Looks like a phonecall to T/S
Still I'll be one of the few with an actual problem and not just trying it on to get a shiny new 250 for 10Meg