Looping sounds not looping?

[Rairun]

I'd noticed some ambient sounds suddenly dropping off before (I believe in ECommons or whereabouts, the windy ambience), but I thought this was just a glitch because I was moving within the zone.

But today I did a fair bit of swimming, and I noticed the sound effect you get when you are underwater only plays for the first 5 seconds or so, for what I presume is length of the sound sample, then it stops suddenly instead of looping. If I resurface and dive again, I hear the sound again, but it still won't loop, even if I'm still underwater.

Is this a unknown issue or is it a problem my EQ installation?