I have seen several topics about people experiencing different forms of the screen blanking to black with NUCs. One of them with the NUC6CAYH, which was solved with v.45 of the BIOS.
It now also manifests after installing the latest Intel Graphics driver v.15.65.4.4944 with Windows 10 v.1803 on a NUC6CAYH with all the latest drivers and the latest BIOS v.49. Pretty frequently the screen blanks for about 1.5 seconds. Downgrading the BIOS to v.48 or v.47 has no effect. Uninstalling the Intel driver and reverting to the Microsoft Driver removes the screen blanking again. Version 45 of the BIOS is not available for downloading anymore but of course the problem shouldn't have been re-introduced in later versions. For the purpose of elimination I had wanted to test that version.
For the moment it would appear this might be caused by the recent v.1803 of Windows 10 for which the BIOS fix may not work anymore. I believe I experienced it shortly too with Win10-1709 which was then solved by upgrading the BIOS to the then latest v.47 but with the latest Windows 10 version it seems to be back.