Who is your ISP?

Such a sudden loss of connection seems to point at the ISP having started to block the ports used by P2P clients.

You could try to configurate LW or BS to a higher port, like 47058, 35248, or 64049.

In LW go Tools>Options>Advanced>Firewall and change the listening port.
In BS go Setup>Connection scroll down where you see the listening port.

But don't forget to configurate your firewall accordingly....
That might help.......

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