1. Check your internet connection. Make sure that you have a strong and stable internet connection. If you are using Wi-Fi, try connecting to a different network or moving closer to your router. If you are using a wired connection, make sure that the cable is properly plugged in.
2. Restart your computer. Sometimes, simply restarting your computer can fix this issue.
3. Update iTunes. Make sure that you have the latest version of iTunes installed. You can check for updates by opening iTunes and selecting Help > Check for Updates.
4. Convert the video to a different format. Some videos may not be compatible with iTunes. You can try converting the video to a different format, such as MP4, using a video converter.
5. Delete and re-add the video to your iTunes library. Sometimes, this can fix the issue. To delete a video, select it in your iTunes library and press the Delete key. To re-add the video, drag and drop it into your iTunes library.
6. Contact Apple Support. If you have tried all of these steps and the video still keeps stopping, you may need to contact Apple Support for help.