Cannot connect to my WiFi: "Saved, secured with WPA /WPA2"
I don't know if this is an Android issue, so much as a WiFi problem. A while ago (before I got my Android) I had some issues connecting my computer to my WiFi -- my computer sensed that the network was there, but wouldn't connect. I was advised to reset the network.  


Unplug all parts of the network: router, modem etc.
Hold your breath for ten seconds.
Reconnect everything.
Try connecting to your network again.


This worked for my computer; give it a try for your phone, and tell us what happens.