Roku Ultra surround lost until factory reset
My Ultra has an issue I think started with the last update. I only get 2.0 instead of 5.1. More oddly, if I do a factory reset, this problem goes away & I get 5.1 again. But after a day, even though I have changed nothing, it reverts to 2.0 again. I've factory reset 3 times & restored surround, only to have it revert to stereo again. Again, no changes on any device. I've restarted the Ultra & removed & restored power, but that didn't work. I've only been able to get the factory reset to restore 5.1.
For reference, this is an Ultra 4660X. It is attached directly to a Samsung TV via HDMI. The eARC HDMI goes from the TV to the ARC on the Sony AVR. I am using the Official Dolby 5.1 Speaker Test Demo on YouTube as reference. It works just after the factory reset, but fails in a day or so.
To emphasize, no changes were made after the factory reset to the TV or AVR. The only changes to the Roku was moving around the tiles & logging back into services.
As you can imagine, I've tried everything I could find online, ultimately leading to the factory reset. While this fixed the issue, the fix doesn't hold.
Rick
You need to verify that you have Volume Modes disabled (these disable multichannel audio).
These are often enabled by default for many firmware versions/builds, so a Factory Reset may re-enable them if you previously disabled them. To make matters worse these audio settings are "hidden" and only available during playback.
To disable Volume Modes for your 4660:
1) During playback (of any video) press remote Options (*)/Volume mode = Off
Otherwise your audio-related settings should be configured as follows:
1) Settings/Audio/Audio mode = Auto
2) Settings/Audio/Preferred Streaming format = Auto
3) Settings/Audio/Digital output format = Auto
Note: If your connected device only supports DD/AC3 (and not DD+/EAC3), you will be limited to stereo audio in many apps/services that ONLY use DD+ (e.g. NetFlix, Prime, Disney+, Max, Peacock).
You can check for DD+ support if you HIGHLIGHT Settings/Audio/Digital output format = Auto - you should see DD+/Dolby Digital+/Dolby Atmos listed as Available for full 5.1 support in all apps/services.