[legion]

I looked at the setting on both the router and the NAS.

The router still has DHCP turned on, but will always assigned the same IP to the NAS.

It looked to me like the NAS is set to accept either DHCP or a static IP, but it has to be told which. It didn't look to me like it would try to provide DHCP, just accept it.

I think part of the problem is almost everything on my network "sleeps" at different times. I think with Windows 7 (based on a little online research), it will try to re-assume the same IP address that was given before, but sometimes finds that the IP address has been taken by something else.

I think what I may end up doing is leaving DHCP on, but assigning an IP to each device, so that they won't conflict. Then Microsoft will fix the problem...