built-in microphone detection
https://thetestmicvisualizationstore.brightsora.com/posts/how-to-effectively-test-mic-with-visualization-for-better-audio-quality
My phone's been doing this weird thing where it mutes itself during calls if I'm not speaking loudly enough—turns out there's a built-in microphone detection feature that adjusts sensitivity based on ambient noise, but it was misreading quiet spaces as silence. Had to disable it in settings before a boss meeting.