https://www.siliconvalley.com/2023/10/04/apple-releases-fix-for-issue-causing-the-iphone-15-to-run-warmer-than-expected/

Apple has released an iOS 17 system update that includes a fix to prevent the iPhone 15 lineup from becoming uncomfortably hot.

According to the release’s accompanying patch notes, iOS 17.0.3 “addresses an issue that may cause iPhone to run warmer than expected.”