IPhone 4S Suddenly Stopped Connecting to WiFi

My daughter's iPhone 4S suddenly dropped the connection to our Verizon wireless network (after being connected for over a week) and each time she tries to re-connect we see the message "Incorrect password".
There are two other iPhones, an iPad, and 3 computers still connected without a problem. I've tried every reset option on the phone and re-booted multiple times. Even setting up the iPhone as a "new iPhone" after resetting all settings didn't work. Still same "Incorrect passwprd" message.
At this point I'm thinking that I should send the iPhone back as a warranty fix.
Has anyone experienced the same problem? If so, were you able to correct it and can you share your solution?
Many thanks!

Hi ejd:
Thanks for posting your troubleshooting steps. The auto-configure option generally works fine, but occasionally, it will not configure Wi-Fi networks automatically. You can follow the troubleshooting steps here: http://support.apple.com/kb/ts1398 There's a segment that shows how to manually configure the Wi-Fi connection called "If you're unable to locate or join a nearby Wi-Fi network.
Give those steps a try, and let us know your results. You may need to call your Internet provider for help on locating your Wi-Fi settings on your computer.
Regards,
MikeS_VZW
Follow us on Twitter @VZWSupport

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