I have a first generation iPad mini that is running 9.2.1, and lately it's been nagging me to upgrade to 9.3.1 with a pop up window multiple times a day. I don't remember an iOS device nagging for an update like this aggressively before, is there any way to stop the constant update requests? This is an older iPad and I'm reluctant to slow it down more and more with newer iOS updates. I'm starting to understand how Win10 users feel.