When i turn my phone on, i can see my wifi network. I click on it to connect and now 2 possible things happen:
sometimes it asks me the password, i enter it but the phone tells me that i can't connect to the network (I'm 100% sure the password is correct!!!)
Or it connects to the networks, rescans the available networks and disconnects from the wifi. I saw once, when checking quickly the IP that every setting was correct, but after 5 sec., the IP, submask and router disappears and i get disconnected.