Welcome to the forum!
The reason you would be losing some audio such as voices is most likely that the voice are going through the centre channel, which may or may not be setup, given it's just a tv (I doubt it would be, same as rear channels). There's a few things that could be causing this:
First thing I would try is this in terminal:
pulseaudio -k
This will restart the pulseaudio and see if that fixes it easy enough. Not a permanent solution, just a stopgap.
Another few options to try:
In /etc/pulse/default.pa
- Add tsched=0 to line load-module module-udev-detect, then reboot pulse with
pulseaudio -k
In /etc/pulse/daemon.conf:
- Set Pulse default-sample-rate to
48000and then reboot pulse withpulseaudio -k - Set enabled-deferred-volume = no and comment out the lines for default-sample-rate and alternate-sample-rate, then restart pulse with
pulseaudio -k
Sometimes setting the sample rate to 44100hz in the default sample rate will help, sometimes it's 48000. It's dependandant on what the systems seem to like the most.
Sorry that this is such a long list. There's so many things that can be wrong with audio that there's a lot of things to try that may or may not work depending on every system config. For mine, my issue was with the tsched option, but for my laptop I had to use a different solution entirely.
I love sound issues 