The Dock keeps switching on my Macs with dual monitors

I have 2 monitors on my computers - 2 Mac Pros (2011) and an iMac. All are running 10.10.1.
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? It started for me with OS 10.9

Hey there Richard,
It sounds like your dock is moving to your external monitor when you are working in that space. On Mavericks, this is expected behavior. The dock can be available on whatever monitor you are currently working on. Here is some more info on that:
OS X: Using multiple displays in Mavericks
Working with the Dock
When the Dock is configured to appear at the bottom of your screen, it's available on whichever screen you’re working on. Just move your pointer to the bottom of either display. When the Dock is configured for the left or right position, it appears on the leftmost or rightmost display edge.
Tip: If you don't see your dock because it's set to hidden or there's a full screen app on the display, move your pointer to the location of the Dock. If the Dock still doesn't appear, swipe your pointer towards the Dock again to unhide it.
Thank you for using Apple Support Communities.
Regards,
Sterling

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