this might be too late or even not the solution for you, but i was expierencing this very same thing and fixed it myself. I think my pc was sending out my ip somewhere to let others know my pc was online was my main thinking in solving this problem. I looked at the firewall exemptions, or "allow app through the firewall", and turned off all unnecessary app for this and havnt had any problems since.. although I didnt try to turn them back on one at a time to figure out which of these was the culprit, i think it was an sdk app I got for the kinect camera,...in my case. hope you figure it out and maybe this helps a bit.
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