im not sure the exact reason for it...but i have had it happen before. When it happened to me i was always on one specific computer at work...the best guess i can muster is that it had something to do with the way the network was set up...(because the computer, and the network for that matter were not net ready / connected)...possibly another computer on the network checking to make sure that it was still there?...never caused any problems tho
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