A strange audio problem

[gantzerteo]

I don't know why since I started playing DDO the Audio comes and goes.
But not the Audio entirely, only certain sounds.
I can hear correctly the BGM anytime, but there are sound like the noises in background that sometimes are audible sometimes not.
For example: the sound of my axe that vibrates a shot or an object that splits when I hit it or even the simple sound of feet on soft, hard or wet ground.
All these sounds come and go, a moment I can hear them, the next not.

I try change options and try different combination but nothing change.

What can it be?

UPDATE: I fix it by myself, However thank you, good game! ^^