This has been happening for about a week now. I won’t even be in a specific app - it’ll just pop up the iTunes password entering screen. I just got a text a minute ago, and it asked for my password. I can cancel it, and read the text - but why is it doing this? I reset it about 10 minutes ago, and it’s still doing it.
Wait… yes it is. It’s hung up on downloading the Shakespeare app. I’ll plug my password in next time and see if it goes. (Though I think that one’s big enough to need to be connected to wifi.)