iCloud backup password verification
My iPhone 4 repeatedly pops open a notification to verify my password for iCloud backup. It reads something like "iCloud backup requires that you verify your password". It happens once or twice a day, usually first thing in the morning (after it has been charging overnight). Is this a bug, or have I missed something in my settings?
Has anybody else come across this, or have any idea how to fix it?
Thanks.
iPhone 4, iOS 5