Virtual Machine stuck in Stopping state

I have a single virtual machine running on my Windows Server 2012 Standard Hyper-V host. Occasionally my VM goes offline (as far as my remote monitoring agent is concerned) and when I check the VM status in Hyper-V Manager the VM shows as Stopping. The vmwp.exe process is still running and cannot be terminated. My only option seems to be to reboot the server.

The server went offline at 10:09AM today and I checked System and Application logs for an explanation but found nothing however in the Hyper-V-VMMS Admin log I found this error at 8:29AM today:

Date:          20/02/2019 08:29:04
Event ID:      14100
Task Category: None
Level:         Warning
Keywords:      
User:          SYSTEM
Computer:      server.domain.local
Description:
Shut down physical computer. Stopping/saving all virtual machines...

I am not sure if this is relevant.

Is it possible to identify why the VM is stopping?

Thanks

David