Hi @JayCal836, thank you for reaching out to us and welcome to the Sonos community. I appreciate you for bringing this concern to us, let me help you out.

First I'd like to ask questions to isolate the issue so we can create a path towards resolution.

1. Is TV Autoplay disabled in the Sonos app? What happens when you enable it or vice versa?
Settings > System > Home Theater Room] > TV Autoplay.
2. Did you turn off the TV speakers from your LG TV when you set up your Sonos Arc? You can check it on your TV settings.

Also, you may try to perform the troubleshooting steps below and see if it works for you.

1. Unplug the HDMI cable from the Sonos Beam and the LG TV. 
2. Unplug the power cable from your LG TV, the Sonos Beam, and any connected audio source (such as a cable box or video game console). Wait 30 seconds before you plug them back in.
3. Reconnect the HDMI cable to your LG TV and the Sonos Beam. Inspect the HDMI cable to ensure it’s not bent or kinked and check to see that it’s fully inserted into both devices.
4. Update the LG TV’s software (if available)
5. Adjust the group audio delay - Settings > System > Tap your Sonos Beam > Group Audio Delay and then choose a delay option.
6. Check for Sonos update - Settings > System > Check for updates.

Please run the TV playback for a few minutes then run a diagnostic. Just include the confirmation number in your response so that we can look up the information. If you have any questions about this, feel free to reach out. We and the community are always here to help.

Thanks Rowena. It works ok now. Had to swap the HDMI cable to a new one and that resolved the issue.