I just noticed tonight that I am having an audio issue with Android TV both for Live TV playback and recorded TV playback. It seems to work fine if I playback on my Android phone.
So, tried watching a recording of Shazam! tonight and noticed there was no audio. Out of curiosity I switched over to watch that same station (Fox local via antenna) and there was no audio. I then tried with some other local antenna stations and no audio on any of them.
If I change the audio track from English to Spanish, then audio works fine (and plays back in English, not Spanish). Selecting English again loses the audio.
I did submit a diagnostics report after trying playback the local Fox station that gave no audio. That was around 10:00pm est.
This is using my Chromecast Google TV device and the Nvidia Shield gives the same results.