I keep getting asked to sign into icloud
My phone keeps asking me to sign into i cloud , I can press cancel or type my password and press ok , but it just keeps asking me all the time.I tried to sign out of my icloud account but it says there was a problem deregistering this iphone with this icloud account that I should try again.
So I get this little window asking me that all the time.
I have an iphone 6 latest firmware 16GB storage.
iPhone 6, iOS 8.4