To address the issues of FilmOn Live Television having ended and the buffering and stuttering problems with ITV Channel 4 that you've been experiencing, here are detailed steps to troubleshoot and potentially resolve these issues:

1. Restart Your Device: Begin by restarting the device you are using to stream FilmOn and ITV. This simple step can often clear temporary glitches that cause buffering or streaming errors.

2. Check Your Internet Connection: Ensure your internet speed is sufficient for streaming. A minimum of 5 Mbps is recommended for HD streaming. Test your speed using a service like Speedtest. If it's slower than expected, consider switching to a wired connection for stability.

3. Clear App Data and Cache: If you are using a mobile device or streaming box, go to the app settings and clear the cache for both FilmOn and the ITV app.
- Windows: You might need to reset the apps or clear cache depending on your browser settings.
- Mobile Devices: Go to Settings > Apps > [App Name] > Storage > Clear Cache.

4. Update Software and App: Make sure that both your device's operating system and the FilmOn and ITV apps are fully updated. Outdated software can lead to performance issues.

5. Change Streaming Quality: If you notice consistent buffering, consider lowering the video quality in the app settings. This can reduce the amount of data required for smooth streaming.

6. Disable VPNs or Proxies: If using a VPN, it might throttle your connection. Disconnect from your VPN service and try streaming again.

7. Contact Customer Support: If the problem persists specifically with FilmOn, contact their support for help with your subscription status since you mentioned the streaming has ended. They might be able to provide a direct resolution or inform you of any service interruptions.

8. Consult Online Forums: Many users experience similar issues. Check forums and communities like Reddit or Digital Spy to see if other users have found solutions that worked for them learn more - learn more - learn more.

9. Adjust Router Settings: You can also try optimizing your router settings. Make sure Quality of Service (QoS) is enabled, which prioritizes streaming video traffic. Also, positioning your router closer to your device can help strengthen the connection.

10. Use an alternative streaming method: If all else fails, consider using a different device or web browser. Sometimes certain combinations may work better for streaming specific channels.

By following these steps, you should be able to mitigate the issues with FilmOn Live Television and ITV Channel 4 streaming. If the problem continues, further technical intervention may be necessary.