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Quote from Belloc»

Could be a firewall problem. Whenever a game is patched, there's a chance that the firewall will stop recognizing it as a safe program and will attempt to restrict network access to it. Have you tried turning off your firewall?

Firewalls allow or disallow traffic. Not sure a firewall issue is the cause. This weekend I noticed that whenever a WD was in the group lag would set in, it was almost unplayable.