You can also try swapping the HDMI or optical cable that is connected to your devices with a new one and see if it fixes the problem. Most sound systems and soundbars use an HDMI ARC connection. If your audio receiver or soundbar is connected with an HDMI cable, make sure it is connected to an HDMI port labeled “HDMI ARC” or “HDMI eARC. "

If the problem is only happening on one TV channel, the problem is most likely with the channel itself. Contact your cable or satellite provider to let them know. Try again later and see if the problem has been fixed. If the problem is only happening with one streaming video, most likely the audio and video are not properly mixed. Contact the creator or streaming service to let them know. If the problem is only happening on one streaming app, try downloading that app to a different device, such as a game console or streaming box (i. e, Roku, Firestick TV). If you are already watching the app on a game console, try downloading the app to your smart TV or a streaming box and see if the problem happens on a different device. If the problem only happens while watching streaming videos, check your internet connection. This could be caused by a poor internet connection. Try resetting your modem or router and see if the problem is fixed.

If the external source doesn’t have an extra audio-out HDMI port, check to see if has a port for an optical or digital cable. You can connect it to your sound system using an optical cable, or a digital audio cable.

Ideally, you want Game Mode to be turned on when you are playing a video game, and off while watching a movie or TV show.

If you are using a Samsung TV, you can clear the cache by reinstalling the app you are having a problem with. Go into Apps’, then highlight the app you are having an issue with and press and hold to display a drop-down menu. Select Reinstall. [2] X Research source You may also want to consider uninstalling any apps that you are not using.

This will wipe all data from your TV. You may want to wait and do this as a last resort.

You may need to go into “Advanced Settings” or “Expert Settings. "

You may need to go into “Advanced Settings” or “Expert Settings. " Not all TVs have a pass-though mode.

You may need to go into “Advanced Settings” or “Expert Settings. " Not all TVs have eARC mode.

Many soundbars and audio receivers also have A/V Sync settings. You can also try adjusting the A/V sync settings on your sound system.