No audio bug

Wanting to know if anyone else has encountered this bug - I hear a sudden 'pop' almost and then there is no game sound whatsoever. I can untab and play audio in other programs so it is exclusively the in-game sound which stops working, the only way to resolve this is to close the game and reopen it. Have experienced this during each time I've played the game, throughout the first weekend also - note that this isn't every map, but during a prolonged period of playing, the audio shuts off sooner or later. Always frustrating of course.