Why does my iPhone keep asking for my Apple ID password?

I have a 5c and I'm on IOS8. I went on it today and it just randomly asked for my password. I entered it but nothing happened/downloaded. I was just wondering if it was a glitch or something.

It's trying to connect to iCloud and clearly has the wrong Apple ID or the wrong password in memory.

When you set up your iCloud account you will have been asked to provide a recovery email address. If you keep getting the password or the ID wrong then you can use that recovery email option to get a reminder of your Apple ID and to reset your Apple iCloud password.

As with all electronic devices, sometimes there's a glitch and the Apple ID and password file on your phone may have become corrupted causing the sudden aberrant behaviour.

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