Hi Hamid.riaz: Thank you very much for contacting the Intel® NUC communities. We will do our best to try to fix this problem.
For this type of scenario we can install the latest graphics driver for the NUC, 4877:
We can also try a BIOS update to the latest version, 0061, using the F7 method:
Another thing to do will be the HDMI 2.0 firmware update:
Some TVs have the option to do a firmware update and sometimes they have their own driver, so that is something that you can always confirm with Panasonic directly, in the case an update is needed:
If you have the option to test the NUC with a different HDMI cable, please try that, also if there are more than one HDMI port on the TV please test them all to rule out a possible problem with an specific port.
Any further questions, please let me know.