PC Shutdown/restart, not a crash?

I sometimes run a modded Minecraft server, for my family only.
It runs on a PC with an a 10 processor, graphics card, 8 gig ram updated to Win 10.
Twice during the day, only one person logged on, the machine shuts down, no lights, the monitor goes dark. It stays dark for about 15 seconds then the boot process comes up. The client pc simply times out when the server goes, logs right back in after it restarts itself.

It comes back up right where it was, my server recovers right where it left off, I am not required to sign back in. Login screen never shows up, and it is password protected.

I will triple check, but I am pretty sure it is set to not go to sleep or hibernate. Both instances were hours apart. No air blockage, and it didn’t seem to actually crash. Any ideas as to what happened and what to look for?

Type in “Event Viewer” in Cortana.
or
Start button
All Apps
Windows Administrative Tools
Event Viewer

Search the Windows Logs for System and then Application.

Also search though Custom Views for Administrative Events.

Don’t panic about every error or warning. Look for something that happened about the time of the shutdown.

Log Name: Application
Source: Bonjour Service
Date: 2/18/2016 11:53:30 PM
Event ID: 100
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: AsusWin10Box
Description:
Task Scheduling Error: Continuously busy for more than a second
Event Xml:
<Event xmlns=“http://schemas.microsoft.com/win/2004/08/events/event”>
<System>
<Provider Name=“Bonjour Service” />
<EventID Qualifiers=“0”>100</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime=“2016-02-19T05:53:30.000000000Z” />
<EventRecordID>13009</EventRecordID>
<Channel>Application</Channel>
<Computer>AsusWin10Box</Computer>
<Security />
</System>
<EventData>
<Data>Task Scheduling Error: Continuously busy for more than a second</Data>
</EventData>
</Event>

Log Name: System
Source: Service Control Manager
Date: 2/18/2016 11:58:39 PM
Event ID: 7031
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: AsusWin10Box
Description:
The Sync Host_Session1 service terminated unexpectedly. It has done this 1 time(s). The following corrective action will be taken in 10000 milliseconds: Restart the service.
Event Xml:
<Event xmlns=“http://schemas.microsoft.com/win/2004/08/events/event”>
<System>
<Provider Name=“Service Control Manager” Guid="{555908d1-a6d7-4695-8e1e-26931d2012f4}" EventSourceName=“Service Control Manager” />
<EventID Qualifiers=“49152”>7031</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8080000000000000</Keywords>
<TimeCreated SystemTime=“2016-02-19T05:58:39.517041000Z” />
<EventRecordID>28768</EventRecordID>
<Correlation />
<Execution ProcessID=“744” ThreadID=“1440” />
<Channel>System</Channel>
<Computer>AsusWin10Box</Computer>
<Security />
</System>
<EventData>
<Data Name=“param1”>Sync Host_Session1</Data>
<Data Name=“param2”>1</Data>
<Data Name=“param3”>10000</Data>
<Data Name=“param4”>1</Data>
<Data Name=“param5”>Restart the service</Data>
<Binary>4F006E006500530079006E0063005300760063005F00530065007300730069006F006E0031000000</Binary>
</EventData>
</Event>

These are the two that show up, looks like Bonjure service tried to muscle in and do something…
probably try to force feed me the icloud update again.

The others, system control managers, say something about restarting the service. Maybe the server is overloading the system? It still acts like it went into hibernation. It did a full on shutdown, the keyboard stays on when the PC shuts itself down, I have to use the shutdown command link for the pc to shut down completely.

Check the CPU fan
Does anyone else have admin access?
Is the timing of the restart exactly the same every day? If so, check for scheduled events

Also check if there’s a startup event (it’s possible to trigger a shutdown event at startup, with a long delay on it)- maybe someone did this as a prank, or for other reasons