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The audio works, it's a decoder issue with the player you're using. I don't know what player you're using, but in mine i went into the settings and went into playback. I switched the audio decoder from Hardware to software decoder. That fixed it.
i know you can change on older one's from in setting expert need change from novice to expert at bottom on left side all way down then sound to software or hard need to reboot it when you change it
try that maybe to test if it works
Don't see how you are getting audio for channels without audio being sent on the stream. Using Kodi 18.6 on a laptop and Nvida box. Go to a channel without audio, click enter,
go to the gear icon. Select audio setting(No Audio from stream)
which kodi you running i run 18.6 i know you change audio decoder from Hardware to software decoder i just said try that to test it
me i think its on there end give it time and all will be back