Please see here
Nuc 2820 display flickering - YouTube
We just got the NUC, have tried about 10 monitors and 5 calbes
Eventually got an OS installed on 1 monitor which was barely working, it looked a bit like the matrix
We use it for windows server and remote desktop onto it, so its not often needed
But I cannot help but think this is a hardware issue?
is this a known problem with a fix?