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Windows Server 2003 rebooting randomly, many times a day

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That happened to me while running Windows 2003 SBS and Windows Server 2003 on the same network both acting as DC for the same domain.
Win SBS 2003 should be the only DC for that domain; if it is not it will restart every hour, then every 30 min.
You will see no errors on the Event Viewer but you'll see info messages telling you when server is coming down.