My computer with 2 monitors keeps switching sides

I have 2 monitors on my computers - 2 Mac Pros (2011) and an iMac.  All are running 10.9.5.  I have one monitor in each case that is the "home" monitor - with the dock and files on the desktop.  All 3 of my computers keep switching the Dock to the other monitor .. randomly.  Once switched, the Dock stays on the other monitor until I use system preferences to change the arrangement. 
Has anyone found a cure for this problem?

Eric
You wanted me to mark my post as solved ---- I did that after 48 hours --- and now the problem is back. 
My dock switched to the second monitor today.
How do I UNMARK my answer as  "solved?"

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