I have also had this happen during my fist session on CA 113, He didnt know he was broadcasting but me and my friend both heard.

This got me to until I realized it stopped when my fists were down. Fists up, stuck walking unless sprint, fists down, shift key works as designed.

I feel like they are aware of this as it is consistent for everyone it seems.

I get this too, are these the 'placeholder' sounds for what will eventually replace the text ui for character condition maybe? Or placeholders for upcoming environmental sounds? Was freaking me out for at least an hour, zombies drinking sodas all around me in the woods.