Try swapping the two TV boxes with each other and see if the error goes away, it’s also important to use the corresponding power supply.
If the error is still present at the new location after a reset, it looks like it is defective, very unusual!
Installationen, Netzwerk, Internet, Computertechnik, OS Windows, Apple und Linux.
Which router or internet box do you have?
https://www.swisscom.ch/de/privatkunden/hilfe/geraet/internet-router.html
In any case, in the router (Internet box) menu you have to give different names for the 2.4 GHz and 5.0 GHz so that you can see the difference when you select WLAN on the mobile device.
Installationen, Netzwerk, Internet, Computertechnik, OS Windows, Apple und Linux.
