Hi,
Since the other thread was locked due to inactivity I assume Im going to repost this issue again since I am still experiencing it.
On my android box, when emby for kodi is configured in addon mode, playback sometimes does not work. Exact details in the op here ( I am getting the exact same problem)
The only thing I can add, is that when the addon is in native/direct mode (ie not addon mode) the issue does not happen.
This leads me to agree and conclude with TeamB tha