@mzbeautiful wrote: If you have the fast start option enabled, disable it. Once I did that I haven’t had any issues with sound
Also do the "restart" option in that same settings>system>power menu. Fast-start is like hibernating a laptop. It saves the memory state, never loads a fresh copy of its programs. If something goes wrong, it stays wrong until you unplug the tv (the off/on button doesn't do it. It just hibernates, and keeps whatever's corrupted). Disabling it is good. But, I think it still needs a restart at that point. The option to restart is right there with fast-start.
Disabling fast-start (and restarting) has worked for a "green screen" problem too. But, not for everyone. (It could be the same with this no-volume problem.). The way Roku's updates break random tvs -- and solutions (like fast-start/restart only work for some people), I think we're seeing how bad Roku's environment/system is. It sounds like a very haphazard hardware environment, and badly managed software development. I don't think Roku knows what's going on (nor cares).
For those who can't fix it: I would do the system>advanced>factory-reset. But, during the initial setup, tell it you don't have internet. Then watch antenna tv and/or connected HDMI devices. See if the problem's gone. If so, it was caused by Roku's famously untested updates. Then you have two choices:
1. You could leave it in this no-internet state to watch antenna tv. For streaming, connect an inexpensive Firestick, Google TV or Apple TV.
If you don't want to use two remotes, use the URC 7935 (simple learning remote).
Roku has/had a good reputation with its external boxes. That might be a valid option too. But, after the Roku TV experience, that seems like a path I wouldn't easily choose. I think Roku's external boxes work better because the hardware is more under its control. I think Roku TV is a disaster because it involves so much hardware variety Roku can't [doesn't want to] work with it the way it needs to be.
2. If the tv works well with streaming, it could be left connected to the Internet, and use an external digital tv tuner (I'm using the inexpensive iView 3500) to watch antenna tv through an HDMI port.
If you don't want to use two remotes, use the URC-7880 (learning remote with number keypad for the iView tuner which accepts number access to channels.).
Those two options would be a way to continue using the tv cheaply ($30 for either the streaming box or tuner). The first option protects you from future buggy Roku updates. You're completely free of the problem (Roku).
"People are often amazed at how much we’ve done with the number of engineers we’ve got." (Roku CEO Anthony Wood, Austin Statesman, Oct 4, 2019). "Amazed" is one way of putting it.
