A:Answer I have also noticed that the Vizio V51-H6 audio lags behind the video, but the lag has been very inconsistent for me. Sometimes there's no perceptible lag, sometimes it's just barely noticeable, and sometimes it's intolerable. I updated to the current firmware version (2.1.1.3), but that didn't fix the issue. Fortunately, the lag is usually small enough that I don't notice it. But about 5% to 10% of the power-on cycles exhibit an annoying lag. I have found that a soundbar power-off/power-on cycle usually fixes the problem.
