Since I jailbroke both my iPad and iPhone on 8.3, I'm constantly being asked to sign into iCloud, usually after a reboot or the device has been in standby for a while. Anyone else have this happening to them? Not really a big deal, but annoying.
Did you downgrade from the iOS 9 beta? I was having that issue while on iOS 9 but not on 8.3 jailbroken BUT Theres still a substantial of iCloud space that's being used yet I have deleted all my backups. I noticed this on iOS 9 where all of a sudden 4GB of iCloud space was being used up but no evidence of what's using it up.
Did you downgrade from the iOS 9 beta? I was having that issue while on iOS 9 but not on 8.3 jailbroken BUT Theres still a substantial of iCloud space that's being used yet I have deleted all my backups. I noticed this on iOS 9 where all of a sudden 4GB of iCloud space was being used up but no evidence of what's using it up.
Many of us experienced this when upgrading from 8.0 to the few updates shortly after. So it does look it's valid password prompts from Apple and not because your phone is hacked. But it did stop a few days after the update.