I have the forwarding timeout set to "10", and the symptom when the forwarders disappear is that the first (new) query always fails while subsequent ones succeed. I presume this is the root hints and cache finally catching up, regardless of the forwarding setting... Re-enabling the forwarding allows initial queries to succeed at first try. Have you seen such a case of disappearing forwarder info on NT4? How can we lock it in?
If that fails, go to Microsoft.com/technet or support.microsoft.com and search using various keywords such as, DNS forwarding, Windows NT, etc.
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