btw my PC is never in sleep mode
i tend to think that it may be something about multiple login from wdtv to pc/nas (in your case)
things i tried:
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completely new pc server with reinstalled windows (polish version) and different hardware (bord, disk, memory)
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tried windows 7 and now windows 8
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firewall turn off
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all settings on sharing up to recommended in forums
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tired 2 wdtv of different generation
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always updated firmware
what was not changed are:
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routers (airport extreme + express)
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wires