Disconnected network drive?

I'm chasing failed backups with NT Backup; backups that worked fine for a few months but back in January they started failing intermittently claimg "specified media could not be found."

So my question for now is this: I've already gone into the registry and turned off the autodisconnect feature under the lanmanserver entry but I can still log onto the server and see this mapped drive as saying "Disconnected network drive."
Why is it saying this and how to I stop it from disconnecting? I've never in my over 10 years as a network admin had to deal with this problem. Thanks for helping improve my mental health.  :)
WineGeekAsked:
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b0fhCommented:
Under the NIC's properties page, check the Power Management tab to see if "Allow the computer to turn off this device to save power" is checked or not.  I have seen this setting hamper quite a few different things.

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WineGeekAuthor Commented:
Oooo, good one! It was checked. We'll see if it worked in the morning.
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b0fhCommented:
Good.  If this doesn't do it, just let us know.
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b0fhCommented:
Thanks... glad I could help.
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