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Checking through Event Manager will show windows last log to see the error, before restarting the server, this can also help in defining the cause of the crash.
Check the Event Manager in Admin tools to review logs and identify the error before the server crashed
Read dns report and active directory report to know what kind of this error
Event manager, go to Administrative tools > Event Manager and check the windows log to see what was the last error before restarting the server, this can help you in defining the cause of the crash,