Proxmox sometimes hangs on reboot

I'm new to proxmox and my set up has worked fine for about a week but starting yesterday would hang sometimes when I called for a reboot.

I thought it was the fault of a Windows VM that didn't shutdown when told (a separate problem I'll have to post on) or one of the other linux based VMs running Sophos UTM but it happens even (though not always) when no VM is running.

I mv'ed syslog to syslog.bak, did a reboot, and went through the syslog file after the hung reboot (hard reset) and...

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