I think I may have found the reason for this happening.
I have the habit of clicking on New Game button, the on the minimize button in the top right window corner. that is the left most button in this screenshot. The reason for the multiple buttons may be that I changed my habit of one long session, maybe two, per day into playing multiple times per day in short one or two game sessions. I am used to 30 second minimum waits before cold boot, but it happened even in those cases.
KPatience screen.

- KPatience window with buttons.
- KPReason_2017-09-17_11-15-56.png (109.89 KiB) Viewed 1052 times
Clearly, I am the reason for this happening, BUT as surely, a cold boot should either clear RAM or over-write it without linking into what is there already. This is similar to the Windows File History mess which was one of the reasons why I kicked that habit. This is also the reason why I said in the bug report that I suspect the dicky Mga6 cold boot to be related to this.
Will keep you posted on what happens with the kill button.
Chris.