Domain Controller

I have a network running 2003 Server, with approx. 300 computers. (win95 - winXp Pro)This past week 5 or 6 different conputers (xp pro) have randomly lost their connetion with the domain controller, not allowing me to log on. To fix the problem, I would log on locally, join a workgroup, rejoin the domain, reboot the computer, and everything works fine. Any idea as to why so many computers have randomly lost their connection with the domain controller?
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check the power settings.
by default it "enables the machine to turn off the network card to save power"
properties of network connection | configure adapter | power management
untick the box.

Also try to check the Windows XP Pro workstation's event log

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Windows Networking

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