I had that issue on the new 256GB jet black iPhone 7 Plus I purchased. I had to return it after a couple of days because of that issue. Thankfully no one purchased my silver 256GB iPhone 7 Plus off swappa yet.
Have not had it yet,but I did with the old Sony Xperia though,that is one reason for getting the 7+,the Sony seemed to do based on ambient temperature, did your 7+ do it at any outside temperature?I had that issue on the new 256GB jet black iPhone 7 Plus I purchased. I had to return it after a couple of days because of that issue. Thankfully no one purchased my silver 256GB iPhone 7 Plus off swappa yet.
No camera overheating errors on my 7 Plus and I've had it since release day.
Have not had it yet,but I did with the old Sony Xperia though,that is one reason for getting the 7+,the Sony seemed to do based on ambient temperature, did your 7+ do it at any outside temperature?