@Tolga. 

I'm sorry to hear about the issues you're experiencing with your Tapo C200 camera after the firmware upgrade. It can be frustrating when a device starts disconnecting and reconnecting frequently. Based on the information you provided, it seems like the camera is having trouble maintaining a stable connection outside of your local network.

To troubleshoot this issue, I would suggest trying the following steps:

1. Double-check the Wi-Fi signal strength near the camera. Even though it's the nearest to the router, obstacles or interference can still affect the signal quality. If possible, try moving the camera closer to the router temporarily to see if the issue persists.

2. Ensure that the camera's firmware is up to date. Sometimes, new firmware versions can address connectivity issues. You can check for any available firmware updates on the manufacturer's website or through the Tapo app.

3. Verify the settings on your router. Make sure that the camera has a stable IP address assigned to it and that there are no conflicting settings. Additionally, you can try restarting your router to see if it helps establish a better connection.

4. Consider adjusting the DNS settings on your camera. While your router's DNS settings seem fine, the camera might have its own DNS configuration. Check if there's an option to manually set DNS servers in the camera's settings and try using the same DNS addresses (8.8.8.8 and 8.8.4.4).

5. If none of the above steps resolve the issue, you can try reaching out to Tapo's customer support for further assistance. They might have specific troubleshooting steps or be able to provide insights into the problem you're facing.

Remember, these suggestions are based on my own experience as a fellow user and may not guarantee a solution. However, I hope they help you get closer to resolving the connection problems with your Tapo C200 webcam. Good luck, and I hope you can enjoy uninterrupted usage of your camera soon!