No internet connection on my Toshiba SMART TV

Hello,

For several months, I haven't been able to get internet on my Toshiba SMART TV, even though it worked perfectly at the beginning. I do have internet on my computer, but then, all of a sudden, nothing works.

I have no knowledge of computers, I quickly get lost, and I don't know what to do.

When I go into the TV settings, under "network/internet settings", I see this:

Network type: Wireless device
Press WPS on WiFi router: Ok (when I click on it, there's a long search, then no change)
Speed test: Ok (when I click, it says no internet, check your connection etc.)
Advanced settings: Ok (I can't select "Ok" with my remote, nothing works, so I have no access to advanced settings, which is ridiculous)

Further down: Not connected

Since I've had WiFi/internet cut-off problems with Bouygues, I'm sure there's been an issue with the BBOX that can’t connect my TV via WiFi, but Bouygues assures me it's not the BBOX.

How can I restore internet? Normally in the settings, I enter a code, select my WiFi from the list, etc., but I no longer have access now, as if it had magically disappeared!!! The TV is still under warranty, and I'm considering returning it altogether.