iPhone Operating System Bug Troubleshooting

My iPhone has started showing persistent operating-system glitches—random freezes, settings that will not stick, and occasional reboots that happen without warning. Standard fixes such as force-quitting apps, hard resets, and updating to the latest iOS build have not solved the problem. I need a clear, methodical troubleshooting session that pinpoints the root cause and restores normal performance without data loss.

Here’s what I’d like from you:

• A quick diagnostic plan that tells me exactly which logs or screenshots you need (Device Analytics, Console output, crash reports via Xcode, etc.).
• in person walkthrough—where you guide me through advanced steps such as safe-mode checks, profile removal, clean restore via Finder/iTunes, or selective iCloud backup recovery.
• A concise summary afterward outlining what was done, why it worked (or didn’t), and any ongoing monitoring steps I should follow.

Please have hands-on experience with iOS system-level troubleshooting, Apple Configurator, and Xcode Organizer so that we can move quickly. If additional specialist tools or beta profiles are needed, just let me know and I’ll install them.

Once the phone runs smoothly for 48 hours without unexpected behaviour, I’ll consider the job complete and release payment.