I'm experiencing major buffering too on all channels that are HD except Fox News. Fox News seems to be working pretty well. TBS, TNT, etc. are unwatchable right now. I chalk it up to the HD upgrade. I'm sure there are a few bugs and they'll get em' worked out soon.....I hope. But, that's why I also have satellite, and Kodi. I have all my eggs in three baskets; IPTV, satellite, and Kodi.