Touch ID on the iPhone 6s is extremely fast, right? Well, it's so fast that it's unlocking my phone for a split second (meaning it sends you to the SpringBoard) and then locking it again, prompting you AGAIN to scan your finger. Second time you scan it unlocks your phone appropriately. It's a bizarre issue that has only been occurring on iOS 9.3 PB3 on an iPhone 6s as far as I can recall. Anyone else experiencing this? Or do I have to reset all settings and see if it fixes it?