[Crssi]

Try the defaults, I assume you're also on the latest BIOS?

I second this, I reset my BIOS to defaults, fixed the boot options and the latest build seems to be shutting down nicely.

Or maybe it's just random and it'll start acting up again.

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Thanks guys. Yes, I'm on the latest bios. Reset and saved defaults, same thing. FWIW, upon shutting down the first time after the reset the shutdown hangs.

It look you have very similar problem as me, but then my NUC began to loose contact with USB devices and internal SSD.
I have returned it for revision... after I have got new one as replacement and now works as it should.

I suggest you to do the same... if power button does not work even if you disconnect all devices, including SSD if installed), except RAM of course, then tyou surely have faulty HW.

On the other hand I suffer from F2 entering BIOS problems. When I hit F2, NUC just freezes (I can get into the BIOS once of twenty tryouts). Interestingly F7 and F10 works everytime.
There are a million posts on internet about this problems generaly with Intel.
Do anyone of you have working workaround tip?