My unit is running Android 7 is this exact thing happens like 3 out of 5 turn offs. I tried playing nice, like don't turn it off while the final movie credits are still playing, stop the movie, exit from Kodi or hit back button to main interface from Media Center.
Often enough TV sees no signal from HDMI but the unit is on, at least the main display shows the time.
I didn't try to see if I can access it from LAN, but I can test anything if you thing is useful. Just tell me what should I try or if it's possible to capture a bug and how to capture it before removing the power from it.
Late edit: unit doesn't react to any of 2 remotes.