password won't save after iOS 6.1 update
I updated my iphone 5 to ios 6.1 and now imessage won't save my password. After the update, I kept being asked to enter my Apple ID password. Each time I would enter the password and 30 seconds later the dialog would pop up again. After entering it one time I quickly navigated to Settings and discovered that my AppleID password was missing from Messages. I entered it there and that stopped the dialog box from popping up.
Later I had to shut down and restart my phone so iTunes would recognize it. After it booted up the recurring Apple ID dialog box started popping up again.
How can I stop this from happening?
iPhone 5, iOS 6.1, 64GB