iPhone 6s running iOS 10.2... issue also occurred under 9.x. Phone shuts down when used for pictures, listening to music when running, etc., when it isn't that cold out (upper 40s F/7 C and up). This is especially true (and aggravating) when taking pictures - seems I get only a few minutes worth of use before it shuts down, even if the phone is fully charged. I've searched the forums/Apple support for possible solutions, but didn't see anything definitive. Is it just a fact of life that I need to get used to or is there something I'm missing? Thanks! PS: RIP Carrie Fisher... she was one with The Force.