[3.1.0.11] No more WIFI connection [Jolla 1]

Since the last update on my Jolla 1 phone, I am no more able to connect to my home WIFI. After trying to connect without any success, it just answer "couldn't connect please try again". I already tried to forget the network, and retry to connect by typing the password : same result. I also tried to put a wrong password : same, not even a "wrong password message" ! My WIFI is protected with WPA/WPA2 PSK. I only use the Jolla UI to connect or set informations. I really need help.