I know that sounded big when you thought it but I think it’s actually something like 683 officially 
.
Gosh… if only a hundred
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still going on each and every flight
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This happens consistently for me, but only in the final stages of flight, roughly when approach hands off to tower. Then all the tower and ground conversations become one-sided.
The issue has been reproducing to me everyday during last weeks, no matter if I was alone with 3 or 4 AIs in a less crowded area or with 300 AIs in a dense traffic area. ATC text stops appearing on ATC log, only co-pilot messages remain, that´s why only co-pilot voice is heard. However instructions are still sent somehow because co-pilot is able to reply to them. Switching to offline voices or disabling co-pilot radio management does not solve the problem. Changing radio channel solves it temporarly in some situations but it´s reproduced again shortly after an ATC center handover happens.
Without ATC text being generated there´s no text to speech conversion possible for ATC, nor for Azure nor for offline voices. That seems to be the reason I would say. The text generation stopping appears to be triggered by the handover between ATC centers. That handover can also trigger the automatic switch from Azure to offline voices in some cases as a side effect.
This smells like a format error in the text strings sent to text to speech engine, leading to a crash in that engine or to strings not being able to be processed. Normally the error is not auto-restored anymore and you need to restart game. Is there any “Tui [52]” flight neatby or other airline containing exotic characters in the text strings? 
Cheers
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Do you have the same issue if you follow the OP’s steps to reproduce it?
Exact same issue - ATC / ATIS voice is heard for maybe 5-10 minutes. As soon as I switch frequencies, its silence.
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Azure TTS is on. No issues until the last Steam update (around 9/14/23)
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