There’s another thread on issues with losing audio comms. But to answer your last issue, while there isn’t a real “mute” button, but you can stop monitoring a comm (or other freq) by just deselecting the monitor button, in this case the com2 button in the screenshot. If you’re not monitoring it (and don’t have the cabin speaker on) then you shouldn’t be hearing anything from the selected radio.
I had my first incident of lost audio the other day, but in my case, I realized my sound system had been changed where I wasn’t hearing all my speakers. When I reenabled my speaker setup, I had audio from ATC/me back. But based on the other thread, I think there is an issue in the sim.
Regards
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