Network Problem

On my network I have a HDX 1000 networked media tank.
The NMT is set to go to sleep if there is no activity after 10 minutes.
Now if I have an open window connected to the NMT on my PC when the NMT goes to sleep I get a BSoD instantly.
Is anyone else having similar problems?
This does not happen on my other PC which is running Vista Ultimate which is also connected to the same network.
I am runnig Windows 7 x64 bulid 7000.

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