I've never used my iPhone's as much as I do my 6+ in a single sitting but since the 6+ is giving me a tablet experience, it's used much more for longer periods. Anyway, after about 40 minutes of use with full brightness on, the top of the phone gets hot. I'm wondering if that's normal. I just feel it's a bit odd only the top gets hot. Figured I'd ask in case anyone has had similar experiences before I make an appointment with genius.