Locked in a login loop

My iPhone 5c regularly gets stuck in a loop of insisting on my Apple ID and password. I’m sure I’m entering the right details but the login pop-up just comes back again. Is this the fault of iOS 8.1? Sian Roberts

This can occasionally happen if your phone can’t connect to Wi-Fi. iOS notices it isn’t logged into iCloud and assumes that’s your fault. Unfortunately the constant pop-ups prevent you from manually connecting.

Powering off the phone and on again will give you a few pop-free seconds for you to jump to Settings > Wi-Fi and join a network. If that’s not enough time, back it up in iTunes, dismiss the pop-up, and it shouldn’t return until the backup completes, which gives you time to sort out the Wi-Fi. If you don’t have access to a network, do a full restore. Sign into iCloud and the cycle should be broken.