27 inch thunderbolt display blacks out after Thunderbolt Firmware Update 1.2

Bought 2 new 27 inch TB displays for two different machines and after a couple of days the Thunderbolt Firmware Update 1.2 appears on my Mac Pro with one of the displays installed. So I install the firmware update. Now my display blacks out periodically and I keep getting Graphic Display Errors with a request to sent the errors to Apple. Running a 32 GB Mac Pro (late 2013 circular style) I have three monitors connected (two 20 inch cinema displays and the new 27 inch display). This machine is supposed to be able to handle three 4k monitors or 6 standard TB displays. I've seen the posts about the blacking out with this monitor but I didn't have any problems before the firmware update and now I've got them pretty regularly. I had the blacking out problem on an earlier monitor and took one of the monitors back and Apple gave me another one and this is the replacement. Same problem, but this one only started after the update. I'm hoping someone from Apple reads these messages and can let me know what's up.
BTW, I also have an older 27 inch Apple monitor that ran perfectly on this machine so I'm disappointed that I spent all this money and now get the blacking out issue.
Mac Pro (Late 2013)
Processor 3.7 GHz Quad-Core Intel Xeon E5
Memory 32 BG
Graphics AMD FirePro D300 2048 MB

I have my Thunderbolt display connected to my MacBook Pro and have been experiencing the same issue, getting worse over time. The folks at my local Apple store did not know what to do about it. So, I looked around and tried different thing.
The one thing that seems to be working is to System Preferences > Build-in Display > uncheck “Automatically adjust brightness.”
I hope this helps.

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