My gf has been having this same issue, most prevalent in combat or in congested areas. Neither switching the khz of the audio in windows or switching to dx9 have solved the issue, don't know what to do now but submit an official bug report and hope that it's seen? Despite how prevalent audio issues have been from what i've gleamed online, it's distressing that it's not listed in the known issues thread on the lodestone. Really hope this gets solved because nothing will pull you out of the immersion harder than sitting in queue forever just to get in and find out your game audio is trapped in purgatory or something.