I do not know what happened, yesterday worked well. From this morning youtube only plays audio and the video image is only a green color. Strangely, the image of the preview when advancing or retreating is seen correctly.twitch and vlc work well.
EDIT: I do not know why it works well now. Well, 3 hours later he fixed himself.
maybe its not because of the box but yourube. i have 2 boxes running kodi addon for youtube and one mibox box using youtube app. i havent updated addon or app for more than 6 months, the mibox is still on mm. recently they three boxes experienced some error when playing youtube occasionally. mibox got back to normal without any action but the kodi addon reported some error and won't play most videos now, it still can play some though. def youtube did some change in backend.