There is a problem with the new version where the sound drops off completely. This can be recreated by doing talk to text (click on the microphone) and posting something on global or legion chat. Typically, after returning there will be no sound whatsoever. I have confirmed that others are also having this loss of sound.
June 2017 - last edited June 2017
Try opening options bottom select settings, slide sound bar to right to set volume level you want exit back to main page Music is the same process
update: What has been found is with the latest update a glictch has caused your sound to turn off on your device, phone or iPad when you get an incoming call. This glitch affects the sound and music. It dose not stop you from fighting, you just lose sound. To get your sound back just turn off your device then log back in.
i will forward this info to EA. Hope they read it and send it to the development people. Seems like an easy fix.