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Had the exact same issue yesterday. Sat in the car for a few minutes with it plugged in (CarPlay active) and almost immediately got the "Charging paused. Charging will resume when iPhone cools down" notification. I've never had that notification before.
 
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After updating there's a lot of background processing going on while charging. Photos is looking for duplicates for example. Give it a few days and it will probably go back to normal.
 
IOS 16 knocked out cellular service on my iPhone 12 Pro Max. It's been two days now. I have talked to apple support (up to senior level tech) about four times, and they can't fix the issue. My carrier (Xfinity Mobile) gave me a free new Sim card. That didn't fix it. First Apple blamed Xfinity Mobile, and then Xfinity Mobile blamed Apple. I just hung up with senior tech for Apple. We were on the Applewatch phone for about an hour and a half. She couldn't resolve the issue. She says I need to go to the Apple store now as a walk-in. I'm heated! No one has offered to replay the phone (which is not even two years old and I never had an issue with it until I tried to update it with the IOS 16 system). I'm highly frustrated and about to look at Apple differently (I own an iMac, iPad, iPhone, and Applewatch. All Apple!!!).
 
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