On Thursday, 13 April 2017 14:41:16 UTC+8, Robert Fisk  wrote:

> I notice this problem when a Windows VM is left running, but doesn't
> receive any user input for 30min or more. The window will disappear
> when I'm not looking and I later find the VM stopped.
> 
> In my case the solution is to use the VM, and it is reliable until the
> work is finished and I shut it down. Just a thought - have a look
> through the power saving & sleep options. It might be trying to "save
> power"  and causing problems with Xen.

Thank you. That seems to be the cause. Power saving was indeed enabled with the 
system configured to suspend after 30 minutes. I turned it off, and the Windows 
VM hasn't crashed yet.

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