I have a user who works half time out of our office, and half time out of our corporate office, 800 miles away. The domain is set up as a single entity. He has printers and network shares mapped for both locations. When at the corporate location, he can see and access shares and printers in both offices. However, when he comes to our location, when he first logs on, everything looks fine. All of the shares show up, and all of the printers shoe to be on-line. Then about 20-30 minutes later, I'll get a call from him, and the network shares and printers in the local office will be unavailable. The shares and printers in the corporate office will still be online. The only way I've found to rectify this is for him to reboot his laptop, after which everything shows up as online and remains that way for the length of his stay here.
The user is using a Toshiba Tecra A11 laptop, running Windows 7 Pro 64-bit. The DC in our location is running Windows Server 2000, as is the DC in the corporate server.