A small experience Story:
I felt asleep while 4k tv channel was running via DVBViewer Addon.
I woke up.
I tried to switch the Channel 2-3 Times.
Then the Box didn't respond to Inputs anymore.
I SSHed into the Box and did a "reboot".
It shutted down but didnt came back.
I had to disconnect and reconnet the Power Plug.
Almost every post or 'experience' you have made here is about 1 problem or another, poor signal, frozen picture, not responding, not rebooting, jerky picture, buffering issues, partitions not resizing, cec not working.
You don't heed the advice you are given so I suggest you buy another device for Kodi because you are just not going to get the experience you are looking for, maybe an RPi3b+ would better suit your needs they are a quality piece of kit that will be give you wonderful 4k playback, working HDR, buttery smooth streaming and super fast wifi for your hardcore pornography collection.