The sound is not synchronized with the video on the Xiaomi TV Box S (2nd Gen).

If the sound is not synchronized with the video on the Xiaomi TV Box S (2nd Gen), please refer to the following steps:
Scenario 1:
If the issue only occurs when you are using a specific app, please refer to the following methods:
1. Please check for any external damage to your TV or the Xiaomi TV Box S (2nd Gen);
2. Ensure that the HDMI cable is firmly connected to the Xiaomi TV Box S (2nd Gen) and the TV. If possible, use a different cable to eliminate the possibility of a faulty cable;
3. Turn off your Xiaomi TV Box S (2nd Gen), unplug it from the power source, wait for a minute, and then plug it back in and power it on;
4. Please check the settings within the app to see if there are options for adjusting sounds;
5. Check for updates for the app installed on the device. An outdated app can cause issues;
6. If the issue still persists, you can consider uninstalling and reinstalling the app;
7. Sometimes, system updates may resolve relative issues. You can check for system updates by going to [Settings] >> [System] >> [About] >> [System update]. If it is the latest version, a message will appear on the screen indicating that your system is up to date;
8. As a last resort, you can try performing a factory reset by going to [Settings] >> [System] >> [About] >> [Reset]. Please note that the operation will erase all the data, so please back up important information before proceeding.
Scenario 2:
If the issue occurs when you connect other storage devices to the Xiaomi TV Box S (2nd Gen) using the USB port and watch the contents inside, please refer to the following methods:
1. Ensure that the storage device is firmly connected to the Xiaomi TV Box S (2nd Gen). Check for physical damage on the USB port. If possible, use another storage device to see if the issue persists; 
2. Unplug the storage device, wait for a minute, and then plug it back in;
3. Confirm that the external device is compatible with your Xiaomi TV Box S (2nd Gen).
Scenario 3:
If the issue occurs when you are using casting on your Xiaomi TV Box S (2nd Gen), please refer to the following methods:
1. Make sure that both your casting device and the TV are connected to the same Wi-Fi network;
2. On your casting device, check the screen mirroring or casting settings. Make sure you have selected the correct casting device and the settings are correct.
If the above troubleshooting methods can’t resolve the issue, please contact our local official service center or your seller for further assistance. They will help you in this regard.