I have the same issue going on. I am running into my audio cutting out in game. First it intermittently goes in and out and then sooner or later it goes out completely.
All other windows sounds are working and all other games work with sound just fine so it is part of the game.
Windows 8 Professional x64
ASRock Extreme3 Gen3 w/ Realtek HD Audio
Skullcandy PLYR1 wireless headset
2x AMD Radeon HD 6950
These are the only four things that can cause audio malfunctions... and since I have all other audio and updated drivers it's neither of these...
I wasn't having this issue until I decided to try out the amount of in game sounds at maximum (It didn't happen right off the from the start of changing these settings though). I turned it back since, but that's the only thing I have done differently then when I first started. It also does happen with a lot of gun shots going on.. a lot of people are around me but the most they are doing is talking over VON.
I found that going into the lobby and rejoining brings back the sound... please fix this issue!