January 2019 - last edited January 2019
I had this too. I could not hear any music or sound effect but I could hear my team members. It happened at the time they started to talk so maybe it has to do with that.
Anyway, a game restart fixed the issue for me. I didnt manage to do it through settings or other means.
Same thing for me, just cut out entirely in the middle of a mission. No one was using a mic that I know of. Only way to fix it was to exit and restart.