I'm having this too, this is game breaking for me not only because i want to hear the awesomely recorded starwars sounds, but because i have to constantly restart my game every 15-20 mins to get the sounds to work. i was also getting a crackling but i think that was a driver issue after updating several of my drivers it seems the crackling have gone away. Alot of others are having this issue as well it mosly seems to be affecting AMD cpu chipsets butr there is the odd intel cpu in there as well.
BF forums page with users reporting issue: http://starwars.ea.com/starwars/battlefront/forums/discussion/8271/audio-issues
Im running
ASrock extreme 9 990fx MB (15.7.1 chipset) (1.7 bios)
FX 9590 CPU
AMD Sapphire R9 390x 8GB GPU (15.11.1 driver)
16 GB gkill sniper 2133 ram