Domain Controller keeps Restarting Randomly
I have Windows Domain Controller 2008, that keeps restarting randomly. when I checked the system log, I found this :
The process wininit.exe has initiated the restart of computer MYDC04 on behalf of user for the following reason: No title for this reason could be found
Reason Code: 0x50006
Shutdown Type: restart
Comment: The system process 'C:\Windows\system32\lsass.exe' terminated unexpectedly with status code 255. The system will now shut down and restart.
This is Physical server, I checked it and did not see any apparent hardware issue, no amber or red lights.
I checked if there is any scheduled task and could not find one.
I really cannot pinpoint the root cause.
Any help will be very much appreciated.
System Manufacturer: Dell Inc.
System Model: PowerEdge 1950
OS Name: Microsoft Windows Server 2008 R2 Standard
OS Version: 6.1.7601 Service Pack 1 Build 7601