Did you recently get upgraded to Roku operating software version 10.5 that is currently rolling out? Settings > System > System update will tell you. (While you're there you can press Check now to force needed updates.)
Some people reporting this problem with Roku 10.5 have found that unplugging both the Tv and Roku has fixed the oroblem
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Can you please clarify the issue you are experiencing? Can you please provide the channel that you are experiencing this issue with as well as the season, episode, and title that you see this happen on.
With more detailed information, we will be able to pass it along to the appropriate Roku team to investigate further.
I am trying to watch the final episode of “This is Going to Hurt” on AMC. There will not s zero sound. The strange thing is that other episodes of the same show have sound, as well as other shows. I have updated Roku software and unplugged my Roku device.