i have a routine Touch ID failing when the phone is cold and my body is hot immediately after tennis practice. it's a total fail, cannot unlock without password. this happens outdoors, so maybe humidity and other stuff have something to do with it, but my "research" shows that EVERY TIME the phone is cold and i try to unlock it after practice, Touch ID fails miserably. anyone else noticed? (again - in winter, outdoors, phone is on a bench, trying Touch ID after sport exercise) is this something that maybe written in the Touch ID "instructions"?