I just purchased this tv last night. The picture quality is great, but I'm having problems with the sound. Any time the sound is not active (whether it be from FFing through commercials or dvd content, pausing, or muting the tv), as the sound starts to come back on it's very quiet and takes roughly 2-3 seconds before it's back to the level it's supposed to be. Is there a settings change I can do to adjust this, or do i need to return it for a new tv? If so, is this a common problem for this vizio?