I have a couple of S905W (p281) boxes. I am able to load the latest version of CE and get them up and running. The issue is that for most of the files I download today, they will only play if the audio is set to 2 channel. I have a 7.1 system and if I select that, there is no audio and the video pauses, freezes, etc.
One box is an MXQ Pro 4k and the other is an X96 mini. My gut tells me it is a kodi issue but thought I would check here to see if others have had the same problem and if anyone found a solution.