A few weeks ago I had the problem that my Windows 2016-Hyper-VMs on Windows 2016 hosts did not restart, they always were hanging, stopped to shut down.
But this strange behaviour was quickly identified.
As we are using Hyper-V replica to have a worst case copy of virtual machines, I created an additional drive which only contains the ever changing paging file of Windows, which is quite big and does not need to be replicated.
And this is the reason why the VMs got problems with a restart - as you can see here:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/c5f2786c-ffac-4f14-b7a9-00612cdf784e/server-2016-vm-hangs-shutting-downrestarting-when-the-pagefile-is-on-a-different-vhdx?forum=winserverhyperv
There seem to be several ways to solve the problem, I took the easiest one for me, and changed the setting for memory dumps in case of System errors in the advanced System settings to "None".
From that moment on, every restart was successful again !
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