Lately my Samsung galaxy s3 has been doing this thing , when I leave my house with it on it disconnects but when I come back it doesn't reconnect instantly like it would do in the past. I have tried Reconnecting it by putting the password in again, Pressing the wps button on the router and my phone, I've tried restarting it and doing those methods again, and all it says is 'saved, and secure' or 'error authenticating network'. So far my phone has done this twice, It reconnected the first time after I left it alone for about 2 hours but I don't have that kind of time to be wasting trying to reconnect my phone and I cant disconnect my whole router like it says in some other forums.