No sound in the game (BF1 and BF4 beta) (Battlefield 4)

Sometimes (quite often) no sound in the game. He is not lost, it is not immediately after launch.
The only way to win is to lay Troubleshooting in the Origin. There is a check files and something ostanavlivaetsya. But it helps only until the next reboot. What could be the reason?
Reinstalling the game does not help.

In the beta BF1 now the same problem. Troubleshooting poke not for the beta, and BF4 (only then the sound appears and in the beta).

Win8 x64