This is not a known issue.
Setups with TV’s normally work best by making a custom resolution, 3840*2160 at 60 Hz with Timing Standard set to CVT-RB (Reduced Blanking).
(For setups with Monitors Timing Standard can remain on “auto”.)
On most TV’s you will need to do some settings like “Enhanced Mode”/ “PC-Mode” and/or “UHD Color” for the HDMI 2.0 port in use.
Please make sure the HDMI port of the Screen/TV supports 4K 60 Hz, often not all HDMI inputs support that.
Please make the HDMI Cable you are using, supports 4K 60Hz / 18Gbps.
Using the upgrade feature to update Graphics drivers can cause issues, because old files can remain in the registry of windows and can be “in the way”.
Please make a new clean driver installation to make sure that part is ok.
Please uninstall the current Graphics driver and all related Graphics software like Afterburner/GPU-Z or whatever graphics related software you might have installed.
Best way to remove Driver Software is to boot Windows in Safe mode, so the registry can also be cleaned.
If your system does not allow you to do that, you can also use a program like DDU to remove such software: http://www.wagnardmobile.com/DDU/
Also, please manually delete the AMD / Nvidia Folder from your C drive.
When done, reboot and manually download and install latest available driver for your Card (don’t let any auto installer do that).