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Thank you for contacting Intel® Communities Support.
Remember we only provide support in Windows environments.
I suggest you to install Windows 10 Operating System to check if the NUC has the same behavior.
If the issue is only with Linux my best recommendation is to contact your Linux Distribution for assistance.
A new monitor plus a HDMI cable made specifically for HDMI 2.0 corrected the screen blanking, which was the most serious issue.
The machine still doesn't wake from sleep unless power is cycled several times, which several threads report is also a current problem in windows.
Thanks for being as useful as an ashtray on a motorcycle Intel.