The behavior that you are getting is an operating system feature. It is necessary to disable hibernation mode or turn it on and off with IR remote control. It is necessary to enable CIR option at Power tab in the BIOS.
Tested devices with 6th gen NUCs are available in the link below. Review Multimedia devices
Thanks Mike for the info.
I disabled hibernation before. I realized that I need to do change BIOS settings yesterday when I was playing with them. not sure about CIR because I don't use IR devices. But everything works fine after I enabled "wake on C4/C5 on USB" (or sth like that -- not sure) in BIOS.