What was the last iOS version where the freeze issue wasn't there? Did it start after the iOS 18.3 update?
Old posts:
Why is my phone freezing after this ios11.2.1 update?
Re: Freezing and lagging Problems after IOS 17 updating
Reset frozen after iOS 17.1.1 update and Apple Pay issue message
After the iOS 17.1.1 update my iPhone is completely frozen
Iphone XS Max freezing after IOS 16 Update
Re: Freezing issue on iPhone after iOS 17.4.1 update
iPhone freezing after iOS 16.3 and 16.4 updates
Therefore, this suggests that certain device settings need adjustment before attributing the issue to iOS.

It's not always the iOS update's fault! Many things can cause phone problems. If you tell people you think it's an iOS update, it might make it harder to fix or find a solution for the real issue.

Remember, the right question often leads to the solution!

Was/Is your device Jailbroken? If that's the situation, please be informed that attributing the issues to iOS updates may not be accurate.

iOS updates aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. The majority of the issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.
Kindly consider checking your settings and addressing any device issues before attributing the issue to external factors. This could be a pure coincidence that the iOS update affected the iPhone functions.
Before initiating a standard iOS update, it's advisable to create a backup. Have you completed this step? If yes, proceed with the restoration from the backup.

See what each update does: About iOS 18 Updates, About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...