chris_uk , Welcome to the UPC Community!
We do not see or we have not registered any interruptions in the system. As a test, we have now made a switch to IPv4, which will be completed in 30 minutes. After that restart your modem. If you have difficulties, perform a modem reset. To do this, gently press the reset button on the back of the modem with a pointed object for at least 25 seconds.
We also recommend that you give your two WIFI’s a different name. For example, at the end you can add _5GHz. Also change the password on one of your WIFIs. After that your devices should not switch back and forth (2.4GHz/5GHz).
Moreover, in 2.4GHz it looks like this for you: (You have set channel 4 on the 2.4GHz WIFI)