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In order to help you better I would like to gather more information about the configuration you have in the computer. Please attach to this thread the .txt file the Intel® System Support Utility will generate https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility
Are you using straight video cables or are you using some type of adapter/splitter/converter?
I noticed that you have a Nvidia GTX 1080 installed, does the same issue happen if you remove the video card and connect the monitors to the Intel GPU?
If possible let me know the model number of the monitors.
To attach a file, you must click “Use Advanced Editor” on the upper right hand corner of the response box, then the “attach” option will appear on the bottom right hand corner of the response box.