RokuJohnB Thanks for the reply. I've literally tried everything you've listed. As I'm typing I've just had to reboot the 4850x Ultra because after watching a 2.5hr video in the background, the audio and video went out of sync.
To directly answer your points:
This issue occurs on all apps.
I've done a total factory reset.
I've switched HDMI ports and also changed HDMI cables.
I've tried AV sync settings on my TV, including switching to PCM output.
I have a Roku Ultra, and starting about 2 months ago (Feb 2025), I started having intermittent audio sync issues.
Sometimes I can momentarily toggle my TV input to my cable box, then back to the Roku Ultra, but other times I have to reset the Roku Ultra, to resolve the audio sync issues. I have an older Toshiba smart TV, and I have reset this TV to its factory condition, but I'm still having the issues.
The audio sync issues occur on all apps that I use on my Roku Ultra (YouTube, prime video, Paramount+, etc)
What has changed in 2025, to start causing these intermittent audio sync issues?
So new update:
After chatting with support, and getting the standard copy and paste support answers, they decided to send me a new unit at no cost. That's great service and I'm so appreciative.
But what's weird is my original 4850x unit had OS 14.5(current retail is 14.1). My new replacement mostly works with HDMI 2.0 auto lip sync, and the Roku app's built-in audio delay correction, works flawlessly, and gets in perfect sync.
However, in any app, any situation, after 1.5-2 hours of play video of any kind, the perfect lip sync achieved by the Roku app goes away, and then the audio goes back to trailing video.
The solution I've found is backing out of the video that's been playing long to cause the audio delay to return, and going back into the same video or any other app's video OR just a restart of the unit. I'm not sure what kind of issue would cause this, but I'm here for any support agents if you need further info.
