On September 21, 2026, reports described a Face ID failure that can freeze and reboot some iPhone 18 Pro and iPhone 18 Pro Max devices running iOS 27. The sequence appears after Face ID fails while authenticating inside a protected app and the user taps “Try Face ID Again.” At least one European iPhone 18 Pro reportedly reproduced the behavior.
The phone may then stop accepting touch input, panic after a few seconds and return to the lock screen after rebooting. The reports describe an early-rollout problem, but they do not establish how many devices are affected. Apple has not publicly confirmed the specific cause or a dedicated fix.
The sequence that precedes the reboot
The reported trigger is more specific than an ordinary failed unlock. Face ID fails during an authentication request inside an app or private area, the user chooses the retry option, and the interface can become unresponsive. After several seconds, the device may restart.
The protected contexts described include Passwords, private Safari tabs and other apps secured with biometric authentication. That makes the issue particularly disruptive: a failed scan that should simply offer another attempt can instead interrupt the entire phone session.
The sequence is reported, not a guaranteed result from every failed Face ID attempt. Some owners have described repeated reboots, while others have not encountered the behavior.
Where the behavior was observed
The cited reproduction involved a protected-app authentication flow. In that testing, a failed Face ID attempt directly from the lock screen did not trigger the same freeze-and-reboot sequence. Separate user accounts have described other random reboots, so those reports do not establish that every restart follows the protected-app pattern.
The affected models named in the reports are the iPhone 18 Pro and iPhone 18 Pro Max. The central software version identified in the reports is iOS 27.
| Situation | Reported result |
| Face ID fails inside a protected app and the user taps “Try Face ID Again” | The phone may freeze, stop accepting touch input, panic after a few seconds and reboot to the lock screen. |
| Face ID fails directly from the lock screen | The behavior did not trigger in the cited lock-screen testing. |
A firsthand account from an iPhone 18 Pro Max owner also described Face ID-related resets and periods when the screen stopped responding in certain apps. That account included a separate cellular-data problem that required a restart, but it does not establish how common any of these symptoms are.
What is known about the cause
The reports have not separated a software fault from a hardware problem. Some users have suspected an iOS 27 bug because the reboot can follow a repeatable Face ID sequence. Other users have mentioned panic logs involving the Secure Enclave Processor or the power-management unit and have described hardware-replacement recommendations from support. Those individual accounts do not establish a general diagnosis or replacement policy.
Screen protectors are also part of the debate, but affected users have reported both phones with protectors and phones without them. That leaves no established causal link between a protector and the reboot.
Apple has not publicly confirmed the specific cause, a failure rate or a dedicated fix. Until the company states otherwise, the clearest description is a reported Face ID-triggered freeze and reboot affecting some iPhone 18 Pro and iPhone 18 Pro Max users.
