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Sounds like a connectivity issue to me. Check the cables, switches, NIC’s etc..etc…. if connection is intermittent, then log on to the DC will also be.
If user is accessing network shares or files, they will need to be RE:authenicated each time connection is re-established.
is this happening only on the one system or any system in the domain? Does the user logon at multiple systems? Are they logged on elswhere now? Have you checked the NIC? Is the system an imaged system? If so, was the system ID changed after it was imaged? Can this person access Email properly from Outlook? reply with this info and maybe we can help more…