My wifi won't stay connected and won't remember the password for the connection. The signal strength is very strong and it asks for the password nearly every time. Once in a while it says saved, secure. Then I will look and the wifi has turned itself off, and I have to reenter the password. Yesterday it stayed on all day, then today it wouldn't connect even after I put in the password and it said it had connected. The icon showed up in the top bar, then went away. I have taken out the battery and rebooted several times. I have turned off the att hotspot and the stay on all night feature. Other times it scans over and over. Any suggestions?