VM Randomly Aborted - Windows 7 on Mint 18.1

[tazman]

I've been having an intermittent problem with various versions of VirtualBox for a while now. My Windows 7 VM runs fine for hours on end and then it will suddenly abort. I've looked at the logs and I see no reason (that I can discern) for this happening.

This morning the VM aborted while I was typing in an MS Word document. Attached is a .zip file of the log taken just after the VM aborted.
These aborts have happened no matter what version of VirtualBox I've run, so I've been upgrading to the latest versions as they've come out in the hope the problem would be fixed.

I am currently running Version 5.1.22 r115126 (Qt5.5.1) with the same version of the Extension Pack.

Any help or pointers to information that might help resolve this problem would be appreciated.