Re: Battlefield 4 Sound Cuts In and Out (PC)
Don't listen to @sossirb, he doesn't play PC and doesn't know what he is talking about.
Have you checked to see if all your sound drivers, etc are up to date? Also, have you tried a simple "Repair Game" via the Origin Client?
Also, do you happen to have Task Manager up while playing? Do so and see if you get any spikes on your CPU when you experience the audio cutting in and out.