Ever since roughly 9.1 I've had my iPhone ask for my Apple ID password for no reason every now and then. Either after I unlock or sometimes even showing a notification on the lock screen. It's maybe once a week (sometimes two weeks) on my phone but I have a family member with the same issue but way more frequent (2-3 times weekly and sometimes even multiple times a day.) my phone is a 6 and theirs is a 6s. Entering the password makes it go away until next time. Totally ignoring makes it go away until next time. Doesnt seem to effect how anything functions but it's ridiculously annoying getting prompts for no reason whatsoever. None of this started until roughly 9.1 and has continued in 9.2, 9.2.1 and even in 9.3 beta. Does anyone know the cause of this?