Thank you for reaching out! I am sorry for the delay in response and the troubles you are experiencing. The forums aren't monitored as closely as our other support channels. I will recommend toggling your audio settings here to see if the sound will resync or reboot the system if you have not done so. Alternatively, you can swap out the HDMI cord to see if that helps. If the issues continue to persist, your best bet is to touch base with technical support for further assistance.
Tony | Community Mod.
I'm also having this issue as well. I'm using a sound bar. Gone through and checked the settings as described in the link above. No change. Very irritating. If anybody has a fix, I sure would like to hear about it.