No audio

Suddenly, I no longer have any audio on my KODI.. There is a red speaker in the top right hand corner and when I go into a stream the audio says “audio undetermined”. I am not able to change the audio output device in system settings and I have watched all of the u-tube videos and pressed all of the mute / F8 buttons on my remotes/ keyboards. All video is streaming perfectly.

Can someone please tell me how to fixConfused

I am using KODI 16.1 on an android system.

Thanks
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