N300 WiFi Range Extender

When I first set up my WiFi extender everything was fine. Then the WiFi turned off and when I went to go back on and reconnect it said my password had changed and I tried everything I could think that it might have changed to and it didn’t work. I then tried to log on and it said my information was wrong which I know it wasn’t because it logged me out before and I answered my security questions to give me my correct details. I then tried to restore it to factory settings because the manual told me to and it keeps going amber and then going back green and not rebooting itself? Help!?