Question about Eurochron Radio weather station

Consult the manual and work through it step by step. Had no problems with 3 devices. If it doesn't work, it's probably a Monday model > return.

Everything worked perfectly for about 3 years. After an interruption in the WLAN connection (I don't remember the reason), I have not been able to reconnect to the WLAN to this day. The connection to the station is still ok, but the date/time is not updated and access via the network is no longer possible or historical data can no longer be retrieved.

It will not do this by itself, correct. Reset it (according to the instructions), it then opens a WLAN AP, connect to the WLAN with your smartphone, then configure your WLAN with the app or browser.