Updated my 6S Plus to 9.1 yesterday. Ever since, it's been getting extremely hot in the area around the back camera. It's so hot, I can barely touch it. It'll cool down quickly when the display's off but gets hot again as soon as I use it - doesn't matter which app is on - simply browsing the web on Safari is enough to get it glowing hot. Battery life is also total crap now (went down from 100% to 75 in less than 20 minutes). The battery settings don't show anything unusual. Anyone else been seeing this? I already did a full reset and set it up as a new phone, still has the same problem.