Thanks for reaching out. These reports and the specific scenarios that can cause this type of issue vary widely. It can relate to a variety of factors from your home A/V setup or settings, to the specific streaming service you are watching, to content-related issues, etc. Given this, there isn't necessarily a single solution to post, or we'd certainly do so.
What we can do is help gather more information about your device setup and A/V equipment, your current settings and configuration, and specific examples of channels/content where you experience an issue, provide additional troubleshooting steps to see if we can help resolve the issue you're experiencing, and share feedback with our team to continue looking into this.
Please feel free to send me a PM with the information requested in the thread above, and I'd be happy to see how we can assist you further.
Roku Community Manager