[AC Question]

After working correctly with the routers in my house my S3 will not connect to any of them, failing the password authentication. A S5, ipad, Mac laptop, Linux laptop, all continue to connect without a problem. I power down the S3 and restart and no joy. I power down and come back a few hours later and power up and it automatically connects...for a while. Once I saw it drop the wifi (in the presence of a very strong signal) and not reconnect, but later it would connect.

I've tried all the suggestions I've found online except resetting to the factory original.

I am wondering if maybe some app tries to update, or is doing something (e.g. Google) that is causing this. Any suggestions?