This only started happening today.
Have you read through the following thread and tried any of the suggestions there?
If the information there doesn't help, post back with the answers to the questions at the bottom of that thread posting.
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Have you changed Routers at all recently??
What was the exact issue, and what games were you playing? Could be a NAT issue, can guide you on how to resolve that!
Sounds similar to my problem I've been dealing with since the weekend, how fun!