Go to SETTINGS >> ADVANCED DISPLAY SETTINGS >> Auto Adjust Display Rate >> DISABLED
None of the AUDIO adjustment solutions you see are permanent solutions. Audio adjustments might temporarily fix this issue.
The root cause is the above video setting, where the auto display rate crashes audio sync. If you use Family Play, the video setting will cause Family play to unsync audio.
Incredible that Roku engineers couldn’t get a root cause fix out via the auto update.