However, the hub is not yet connected to the app because it is still registered in the old network.

Please contact our Galaxus Assistant in this regard so that we can help you individually with your request: https://www.galaxus.de/help

With the SureFlap Connect Hub, you can remove the old network yourself and set up a new one. Here are the steps you can follow:

- Make sure the hub is connected to the power supply cable.
- Open the Sure Petcare app and log in.
- Select the hub you want to configure and follow the instructions in the app to reconfigure the device and connect it to your current Wi-Fi network.

Regarding the problem with the green lights going out after a while:
- Check that the hub is properly connected to the internet. Make sure the Ethernet cable is firmly connected if you are using a wired setup.
- Check if there are any software updates for the hub, which you can find in the Sure Petcare app.
- If the problem persists, it may be helpful to restart the hub or reset the network settings.

If these steps do not resolve the issue, I recommend contacting SureFlap customer service for further assistance.