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I was using my iPhone 7plus in the car today. It was charging and running waze (nav program). The outside temp. was 81 and air was on in the car. The iPhone 7 plus overheated and turned off giving overheating message. Before powering off the display got progressively darker until the phone completely powered down. I held the phone near the AC vent and it did finally "cool off" I have used every other iPhone in this same manner and have never had one power down due to overheating. The outside temp wasn't even that hot 81F. The phone did recover however I am somewhat concerned because I use my iPhones everyday for navigation in the car. I really can't have a phone that powered down at moderate temperature. I have an apt. with Apple tomorrow. Will let you know what they have to say.
Just got back from the Apple store. The phone heated up again while using WAZE and charging in the car. Outside temp. was 83F. Phone screen dimmed so dark that I was unable to see anything tried to close the app. but the screen touch was unresponsive. The screen remained dark for about 10 minutes...lucky I was at Apple and they were able to see how dark it had become. They ran diagnostics on the phone and did see that the heat sensor had triggered. They had no explanation for what was happening. They seem to feel that the phone is operating normally... I've never had any other iPhone perform like that. Bottom line, they are ordering a one time warranty replacement under my apple care. If it continues to happen they will try a software reload.
They should have just given you a new iPhone right then and there, you are within the 14 day window.
No need for you to use your warranty. What the heck is that place doing?