I've just synced my iPhone with iTunes to get some Music on the iPhone. After doing so, the iPhone wants my Apple ID password, when I try to launch a third party app. All Apple apps (Photos, Safari, Notes, etc.) work fine, but all third party apps require me to sign in to the App Store first. I mean once; as soon as I signed in once to the App Store, all third party apps start to work again.
On my iPhone I use the same Apple ID as in iTunes.
This is the popup when I'm not connected to the internet:
By the way, this is by far not the first launch of "FBReader".
And when I'm connected to the internet it looks like this:
I can't even do this on the iPhone, because my password manager doesn't work of course! I need internet and a second device to get my iPhone working again.
Is this expected, normal behavior? Is every Apple user suffering this?
Or is there something fishy on my device(s)? I suspect that this is a copyright mechanism that runs amok because the iTunes sync cripples my iPhone.