Been happening to me since day one of the xpac. I've tried changing the audio settings but nothing fixes it. I've had to swing my camera around to hear NPCs that are present - have to angle it in front of them. If they are speaking over the "com" like in the story they are barely heard or not at all. At times I've missed whole segments of dialogue because I was busy moving around or distracted by events so I can't stop to read or discern what's being said.
I'm at a loss. Am very disappointed.