I bought a Netgear wifi extender, and got it connected to my wifi router before, but multiple times it has disconnected from the router, and I have been able to reconnect it to the router, now it disconnected from the router and I can't get it to connect to the router again, but it shows the network when I go to connect to my wifi on my PC, but it doesn't connect to it, and the extender shows it isn't connected to my router, how can I get it connected to my router again?