In T122385#1590535, @revengeuk wrote:

Yes, 7.1 Surround on USB causes issue, 7.1 on 3.5mm Jack (onboard sound) works fine. Only effects 64-Bit ARMA - USB 7.1 headset and AMD CPU it appears!!??

I also get some audio stutter, especially when engaging in combat with a lot of gunfire and explosions happening around you. I don't have any problems with my FPS during audio stutters.

Thank you. This resolved the problem. :)

It has to be said it started after the new update