My iPhone has repeatedly shown the box 'Sign in to iCloud, Enter the Apple ID password' for (my email address) whenever I want to open an app.
No matter how often I enter my password, it won't accept it. I have changed my password seven times now, but still can't get past this box. Driving me mad.
Do you use icloud? If not make sure it is turned off in settings if you can. Is your phone password protected. Try turning that off. Maybe it will work