I am having the same issue, but intermittently.
When it happens, I notice that this “helpful feature” (AI radio communications (ATC) ) has been activated without my initiation:
I see that this is a reported bug, if the root cause for you is the same as for me:
https://forums.flightsimulator.com/t/ai-radio-communications-atc-gets-set-to-on-even-after-i-set-set-it-to-off/433828/