Retina display on Mac Pro goes off randomly while working

My client has the latest Mac Pro (cylinder) with two screens, one of which is the latest Apple Retina display.
In my client's own words, here's the problem:
"My monitors have been really buggy. The retina display just cuts out - then randomly comes back on.
I have verified that all cords and plugs are secure and that the power source is on... it's been doing this since the beginning but is worse now.
Sometimes one stays on and the other goes off -- sometimes it switches.  When I reboot the same thing happens.
I ran disk utility permissions and repair just in case and all seems to be in order."
Mac Pro (64G RAM)
I searched online but haven't found any info on this problem
Any ideas?

Howdy generatech,
To help resolve or troubleshoot the issue with these monitors intermitently turning off on their own, I would use this part of the following article:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Try unplugging the video adapter or cable and then plug it back in.
If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
Reset the system
You can reset the Mac's parameter RAM and SMC.
Thank you for using Apple Support Communities.
All the very best,
Sterling

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