Something to test

All the guys with sound loss in MP, try setting your ingame sound option to exactly what your soundcard sound setting is.

Ie if soundcard is surround set ingame to surround.

Cleared up my sound problems keeping them the same, if i change the game setting it causes sound bugs and crashes. It seems there's some kind of conflict between soundcard and ingame sound thats been knocking my sound out.

Hope it works for you all.

Bp