Loosing sound after playback


I use RPI2 + OSMC for playing cartoons from ext USB HDD for my kids. USB HDD is connected on RPI2 over powered USB hub.
But randomly, after some playback, when one file ended, the sound is muted. The volume is on max but there is no sound. I have to restart my RPI2 to get sound again. Is there any way to fix it or to get sound back without restarting the device.
I hope You understand my problem. :smile:

A debug log may be able to provide some clues


Here it is log after loosing sound.