Hey mgiles79,
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. Have you noticed any other streaming sites buffer when trying to playback HD content on a direct ethernet connection? Have you tested the same ethernet connection on a different device (desktop, etc)? As for the WiFi, it may be WiFi interference, I have more details on that here. I'd recommend trying some steps here to help improve that experience.
If the issues continue, your best bet is to touch base with technical support for further assistance.
Cheers,
Tony | Community Mod.