Every once in awhile, my ATV2 fails to recognize my computer even though the computer is out of sleep mode and itunes is open. Anyone else have this problem? Is it remedied by a simple unplugging and, if not, is there something else I should be doing? I'm thinking of arranging my setup in such a way that unplugging would be a pain, so if that would work, I'd still like to know if it's the only fix. Although it only happens every now and then, it would certainly be helpful to know how to correct the problem whenever it does happen. Thanks in advance for any assistance.