I’m not sure if this is caused by a latest update, or the use of the power supply for the Raspberry Pi 3 B+ (5v 2.5A), but the USB microphone randomly freezes (as seen in the CLI).
The CLI works if you type something to it, but the microphone did not work after the skills have loaded or after the wake words have loaded. Sometimes the output audio gets muted, especially after restarting the Pi. This did not happen before.
This happens on both the stable and unstable images, and the speaker-test and the mic-test worked normally.
The other old posts that had this issue had some solutions like editing the /etc/pulse/default.pa file, but this did not work.
Could this be a PulseAudio issue?
EDIT: Just double-checked with alsamixer after restarting the pi, pulseaudio always mutes the output volume.
EDIT 2: Here is a link to the voice.log