Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Channels on Roku are maintained by the channel developer themselves. Since the issue only happens within AT&T TV, contact the channel provider's customer support team to report the issue and get help. There's likely an issue within that specific channel that needs to be addressed with an update from them.
The ATT TV/DirectV Stream audio issue started right after Roku 10.x software update. But as noted by others every other app on Roku does not have this issue…Prime Video, Espn, HBO Max…From working with ATT support I can tell you this is not a priority, and if watching Live TV is important, you’ll want to change providers.
ATT/DirectTV Stream sound problem is happening with me too. On ALL my Roku devices. It is only the ATT/DTV app having the issues. Sound will cut out every 15 seconds or so. Now the volume is in constant flux (way down then way up then normal...like a wave up and down and it doesn't stop).