Battlefield 3 sound problem

ZakX11

Distinguished
Apr 4, 2011
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I recently got BF3 and my PC is good enough to run it on medium - high graphics.
However when i first played the campaign it was fine but recently there has been a bad problem of the sound that makes the experience horrible.The sound keeps repeating itself like - We need to captuuuuu--capture objective bravvvv--bravo.
Contaaa--Contact!
However this happens only in campaign mode.The sound in multiplayer is fine so I don't think My pc not being good enough is the problem.
Please tell me what can I do.