My 6-month-old iPhone 6 is hot at the top, by camera lens, won't hold a charge and the camera is just black. All other functions are normal. This started a few days ago.
When I have seen this behavior, it has been hardware failure (usually due to water damage). If your phone is less than 6 months old and you have no reason to suspect water damage, you should contact Apple at https://getsupport.apple.com/