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If you can find out what port BT is using (I don't know), then call up your ISP and ask them what's up. In my experence, i've found that ISPs will block certin port numbers randomly for reasons I have not been able to determine. It also might be some random garbage that they're doing on their end of the line, so the best advice I can think of is to call up their tech support and annoy them until the problem fixes.
Oh yeah. Some Routers (Belkin, cough. Maybe others) like to reset themselves whenever they think someone is trying to hack into your network. If such is the case, try turning off NAT, or set up a DMZ for the port BT uses.
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