The latest Battlefield 4 update for PC has been rolled out today, bringing numerous fixes to the game including an audio bug where audio would sometimes randomly drop out. Below are the full patch notes for today's update, which should download automatically upon booting up.
CHANG LOG:
Removed the blur effect on soldiers that appeared when Commanders were using EMP attacks
Fixed the audio bug where audio sometimes randomly dropped out while playing on certain multiplayer maps (typically Golmud Railway and Hainan Resort)
Fixed the "one-hit kill bug" where occasionally damage from a single bullet was applied multiple times
Fixed a common crash that would occur when exiting from the Single Player Campaign to Main Menu
Tweaked the network and computer performance screen to show proper values. Players can now test their computer and network connection and get recommendations if they need to adjust something to improve their gameplay experience