Please try the following recommendations:
Update to the latest BIOS of the Intel® NUC
Bios version 0042
Install the latest graphics drivers
Make sure you change audio cables and if possible firmware updates
Hope this information is helpful.
Please do let me know if you need further assistance with your Intel product, I will be glad to assist you.
It looks like my BIOS is already at version 0042, but I reinstalled it just in case. Installed the graphics drivers. I'm not sure why I'd need to change the cables. They seem to work fine as long as the TV is not put to sleep. As I mentioned, there are no firmware updates for the TV (and again I don't think I'd need one, since it worked just fine with my seven year old PC). I'll see if the graphics drivers update made any difference.
Thanks Allan. It looks like the 6414 driver is beta that is not intended for general use, so I better wait for the next RTM version (don't want to take chances).