When playing and deployed on a mission, whether a main mission or other, any incoming transmissions from any characters gives me text but no audio, but still plays at a speed as though there should be audio. My player character responds with voiced dialogue, and when I'm on the Command Bridge I get full voiced dialogue from whoever I interact with. It's only on missions when I get an incoming transmission from someone where no audio plays for them.
I've tried deleting and reinstalling the game on my console (Playstation 4), but the problems still persists. Adjusting any in-game options doesn't seem to have an affect. Hope this information helps.