Here are the steps you can take to troubleshoot your issue:

1. Check the Internet connection to make sure it is stable
2. Verify there is no firewall blocking the connection to the hosting service
3. Check the media player settings on your device to make sure they are not preventing the videos from playing
4. Disable pop-up blockers and other browser extensions
5. Clear your browser’s cache and cookies
6. Try restarting your device and verifying the resolution of the video