I know this is an old thread but I think I know what the OP meant and it is also happening to me. Let me explain, after playing a movie with the himedia external player using the wrapper in kodi and then exiting, sound is completely lost in the kodi interface. If I then start lets says a trailer using an internet stream with stereo sound (2channel) using kodi's internal videoplayer, no sound will be present either. But using the external himedia player to play local media works fine. Sometimes after a period of time sound comes back again to the kodi interface and to kodi's internal videoplayer.
To fix this I have to restart kodi, or toggle the hdmi sound output in the q10 pro's settings. Please help.
My setup consists of an lg oled c8 tv and a denon x-4500 amp. The q10 pro is connected directly to the amp.