Why are video and audio out of sync when watching my content on a specific device?

Specific devices on the market, and their operating systems, cause an audio/video sync issue as they separate the audio and buffer it faster. Specific Roku operating systems on the Roku 2 and 3 boxes are known to produce such as an issue. If you detect audio/video sync issues, please report them to customercare@lightcast.com so we can update this list.

What you can try to fix it:
Update the operating system of your Roku device to the latest version (can be done by selecting "System" and then "System update"), and/or unplug the device from power and reconnect it to reboot the device. We recommend to do both - updating the operating system and rebooting your device - to leave nothing undone.