Audio Bug Beta BF6. Game Launch (Opening Trailer) sounds playing during Matches.

That’s such a strange issue you had.
I also experienced two weird audio problems: the operator voice lines (like their shouts) were completely missing, and the reload sounds didn’t play at all. I even verified the game files on Steam but it didn’t fix it.
Some might say maybe my PC wasn’t strong enough, but that’s not the case — my PC was more than ready for this game. Still, it had these strange audio issues.