Domain controller malfunction

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http://serverfault.com – We have one domain and two domain controllers (on Windows Server 2008 Enterprise). For about a week, we have enormous problems: some users can't log in to Windows (domain could not be contacted). Sometimes restart of Windows helps, but mostly it doesn't. As administrator, I can't log in to DC0, on DC1 I can. The other administrator for example can log in to both DC. I attached dcdiag /test:dns for both DC0. DC0: Directory Server Diagnosis Performing initial setup: Trying to find home server... Home Server = DC0 * Identified AD Forest. Done gathering initial info. Doing initi (HowTos)