Hi Fonzie,
Please examine the logs inside of the VM to see precisely which account is triggering the restarts, plus look for related Errors/Warnings as to what is causing the restarts. For example, sometimes a critical windows service will fail and the system restarts as a result.
Main place to start is in Event Viewer (eventvwr.msc) -- Windows logs -- System and look through Errors and Warnings. Additionally, look for events with Source: User32 Event ID: 1074 for description of restarts--you would typically see these if some process requested a restart under normal circumstances.
If the above is the case you would need to diagnose the cause of the failing service and fix it in order to stop the restarts. Or, you may choose to create a new VM and copy over any necessary data. Once you verify the new VM is working properly with all data present you could delete the original VM.
Thanks.
-TP