Gabriella We have checked your line and everything is fine.
The following tips may help you to find a solution:
- your two WIFIs have the same name
- please add _2.4GHz at the end of the SSID name for 2.4 GHz
- change the password for the 2.4GHz WIFI and use another one than the 5GHz WIFI
- Then connect the UPC TV Box to the 2.4GHz WIFI.
I also notice that there are many WIFIs in your property. It looks like this in your 2.4 GHz:

And like this in the 5GHz WIFI:

So, for example, with the UPC modem, if all else fails, you could disable all WIFIs and only use your Netgear mesh system.
Greetings
Daniele