Thanks for joining the NUC community.
It appears to be a problem with the NUC itself or video ports.
Please try rolling back BIOS to version 0028
See below for NUC recovery instructions
Select BIOS video primary on Auto and select proper HDMI source out of your TV or screen.
The Bios Recovery didnt Help but i found the reason for the problem.
Its the 5v Power on the USB 3.0 Ports after shutdown.
Im using a pulse eigt cec adapter and after shutdown he still gets power and that causes the error.
when i plug in the usb cec adapter with a little offset everything works fine.
So i need no disable the 5v on the USB Ports after shutdown.
How do i do this :<?