Hi,
I've the Intel NUC DN2820FYKH and the latest BIOS for it- 0034.
I'm happy to report, now the NUC doesn't restart after shutdown.
These are my "Power settings in Visual BIOS :
"After Power failure : Stay off"
"Wake on Lan : Stay off"
"Wake on USB S4/S5: Disabled"
"PCIe ASPM: Enabled"