Hey ziggurcat,
Thank you for reaching out! I am sorry for the delay in response. The forums aren't monitored as closely as our other support channels. I will recommend trying some of the troubleshooting steps here or swapping the HDMI cable to see if it helps. If you continue to notice the same audio drops, your best bet is to touch base with technical support to fix the issue.
Cheers,
Tony | Community Mod.