I've been experiencing issues with my iPhone 14 for the past three days. Since updating iOS, my phone has been freezing and crashing frequently, making it almost unusable. It has sent three iOS panic reports with the message, "Your iPhone was restarted because of a problem." It crashed 2 times writing this post.
You haven't said which version of iOS you updated to.
Besides, these are the Developer Forums, where developers of apps for Apple's platforms ask each other for hints and tips on coding. These forums are not where Apple's actual developers chat about product issues.
Your question is more of a product support one, so I'd suggest you ask it over at the Apple Support Forums. Thanks.