@Steevo You can just choose and select the forget the network and again enter the password and try to connect. If not working then reset your router and then configure it and then again try to connect. My problem is not similar but when I try to connect with my iPhone, it showing iPhone error 4013 and I don't know what to do? One of my friends suggest me a solution and after visiting there I solved my error. You can have a look there and try to solve this issue.