Most important: it’s software, not hardware
Here’s what the forum panic won’t tell you up front: you almost certainly don’t have a faulty phone and you have no repair to pay for. The problem comes from an iOS 27 bug that Apple has publicly confirmed — and on September 29 it released exactly that update: iOS 27.0.1. Some people have already asked Apple for a replacement — it isn’t necessary. Install the update and you’re done.
Problem 1: failed Face ID → freeze and reboot („panic-full”)
The most serious and most common one. The scenario is very specific: you try to open a protected app — for example the Passwords app or a private Safari tab — with Face ID. The first check fails, you tap „Try Face ID Again”, and at that moment the phone freezes, stops responding to touch for a few seconds, then hits a kernel panic and reboots to the lock screen.
The detail that clears things up for many people: the problem doesn’t occur with normal Face ID from the lock screen — only on the retry inside protected apps. A trace named „panic-full” is left in the phone’s logs. It’s speculated to relate to the new, smaller Face ID module on the 18 Pro series combined with an iOS 27 bug — but the cause is software, not a broken part.
Problem 2: touch that stops responding
Separately from the reboots, some users report touch „dead zones” — the screen briefly ignores taps and swipes, especially right after unlocking or during rapid typing. There’s also a reproducible case: if you swipe down simultaneously from the top-left and top-right corners (opening Notification Center and Control Center at the same time), touch can lock up completely.
This is software too. Install iOS 27.0.1 (released September 29), then check: if the two-corner gesture still locks touch after the update, avoid it and let us know. If the screen „freezes”, do a force restart.
„It shuts down and only powers on manually” — force restart
After a kernel panic, the phone should reboot on its own within a few seconds. In some cases it stays stuck on black and needs help. The force restart, step by step:
- 1 Press and quickly release the Volume Up button.
- 2 Press and quickly release the Volume Down button.
- 3 Hold the Side button until the Apple logo appears (it can take 10–20 seconds). Then release.
You won’t lose your data — it’s just a restart. If a specific app repeatedly triggers the freeze, open it with your passcode, not Face ID, until the update.
What to do now
Install iOS 27.0.1 (available since Sept 29)
From Settings → General → Software Update. It’s the official fix for the Face ID restart (and for a colour artifact on photos taken at 2x).
Use your passcode in protected apps
For Passwords, private tabs, etc., unlock with your passcode instead of Face ID — you avoid the exact scenario that triggers the reboot.
Avoid the two-corner gesture
Don’t swipe down from top-left and top-right at once. Open Control Center and Notification Center separately.
Don’t swap or repair the phone
It’s software. Don’t pay for a repair or reflexively demand a replacement — the update fixes the cause.
The fix is out: iOS 27.0.1
The bug surfaced around September 21, Apple confirmed it on the 23rd, and on September 29, 2026 it released iOS 27.0.1 (build 24A446). In the official release notes, the update fixes two issues on the iPhone 18 Pro and 18 Pro Max:
- ✓ the unexpected restart when Face ID fails to authenticate — exactly the problem in this article;
- ✓ a colour artifact that could appear on photos taken at 2x, under certain lighting conditions (at f/1.48), on a small number of devices.
Install it from Settings → General → Software Update. The same evening also brought iPadOS 27.0.1, plus iOS and iPadOS 26.7.1, macOS 27.0.1 and 26.7.1, macOS 15.8.1 and visionOS 27.0.1 — if you have other Apple devices, they’re worth updating too.
If the problem persists after the update
In the rare case where the crashes continue after iOS 27.0.1, you might indeed have a faulty unit — and the iPhone 18 Pro, being new, is under the 1-year Apple international warranty, so replacement/repair is covered. If you want a second opinion first, we’ll go through the „panic-full” logs and tell you honestly whether it’s residual software or a hardware sign — without charging you for a problem that doesn’t exist.
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Sources: 9to5Mac (the Face ID bug), 9to5Mac (Apple confirms the fix), Macworld (the two bugs), AppleInsider (iOS 27.0.1). Status may change as Apple ships the update.