Audio Sync
You may experience a channel where the picture and the sound don’t match up. To correct this, press the select button, scroll down to the menu across the bottom, click on Audio Sync and change the offset up or down a little at a time. Go back to what you were watching and see if it helped. Keep doing this until the audio and video are synced together.

Note
There is an option to apply your changes to all channels. Do not select this unless you are experiencing the same problem on all channels.