I read about this happening on the XDA Dev board, and it's happened to me once last week. One person's findings seemed to be mine as well. When it happened, it was because I had let my NC go to sleep before turning off the WiFi. (Normally I turn off WiFi as soon as I'm done with it to save battery power.) Simply resetting my router worked--a bit annoying but an easy fix. Now I'm just more conscientious about turning off my WiFi.
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