Last week I have seen an interesting behaviour, and this has happened to two of our client. The lsass.exe causes reboot of SQL Server. LSASS.exe as you would have known probably is an executable in Windows Operating system that is responsible for forcing security policy for the system. What will happen if there is a fault in lsaas.exe or lsass.exe is forced to terminate? Well, it will result in restart of the machine. And, that is what I mean here, lsaas.exe causes reboot of SQL Server.
Comment: The system process 'C:\Windows\system32\lsass.exe' terminated unexpectedly with status code 8.  The system will now shut down and restart.
At the client server, we have few third-party apps that have crashed around the time of reboot happened. We haven’t established the reason yet as RCA is still pending. Have you seen this kind of error for any of your server? Were you able to establish the reason? Do let me know in the comment section.