I understand you are having troubles streaming Netflix in UHD in your computer.
Let me apologize for any inconvenience this issue may be causing to you.
Have you checked the Netflix requirements for UHD that are on this link? https://help.netflix.com/en/node/13444
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
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.
as far as I can make out I meet all the criteria for 4K UHD playback (works through app on tv and blu ray player) but it just doesn't want to play ball via PC.
Please find attached the log file.
sysinfo.txt.zip 6.6 K
Do you have HDMI direct to TV?
I had the same problem when using a splitter. Netflix 4k would work fine with the TV app (LG) but trying to use Netflix with Win 10 app from app store and also IE, Chrome and Edge it would not work and would get a flicker, then black screen, then total loss of signal.
Removed the splitter and (so HDMI-HDMI direct to TV) and all is good again.