Please follow the below steps:
1. If may be that internet speed is slow. Try watching the videos in a Wi-Fi environment.
2. Try a different video playback source.
3. Lack of support for video playback plug-ins. Try downloading and installing the Adobe Flash Player plug-in.
4. Try a different browser.
5. Confirm whether mobile data is turned on. Check whether your mobile phone data package has exceeded its limitation.
If the issue persists, contact the Nothing Support Team for further assistance.