I still have issues playing live TV from Nvidia Shield TV. While watching Live TV, it will occasionally loose the channel and error out. When I want to rewind or go back a little to re-watch something it errors and looses the channel. Watching Live TV from PLEX is currently just not user friendly and we have to use Live Channel App or HD homerun app. I like live channel better because you can rewind or play back. A lot less errors.
I would like to get my Plex app to play live TV better but no luck so far.