Constantly having to login

Every day sometimes multiple times a day I can't connect to the extender and it tells me login required. I get on and relogin and I have to manually tell it which rounter to connect to and let it do the set up proccess all over again. It just started doing this 2 weeks ago and is becoming a more and more frequent thing. Any advice on how to fix this? It's getting very frustrating to be in the middle of doing something online and all the sudden I am disconnected and have to spend time resetting the whole thing.