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Please can you tell me what type of master socket you have?
And whether your area is experiencing any problems? http://bt.custhelp.com/app/answers/detail/a_id/15036/~/service-status-messages
Can you now please connect to the test socket (by unscrewing the lower half of your master socket) like in the picture below with just the router connected and no other device connected, so we can check to make sure its not your internal wiring.