iPhone 18 Pro Touch Failure and Restart After Face ID Failure
Some iPhone 18 Pro and 18 Pro Max devices experience a complete touch failure and kernel panic restart when the Face ID recognition fails for the first time in an app, and the user taps "Try Face ID Again." This issue does not occur during lock screen unlock but happens in apps protected by Face ID, such as password entry, Safari private tabs, and Wallet.
9to5Mac replicated the issue on at least one European version of the 18 Pro: covering the face to simulate a failure and then tapping retry caused the device to stop responding to touch and restart. The extent of the issue is unclear, and it does not trigger on all devices. Devices began arriving around September 18, with some users reporting three restarts within 24 hours due to Face ID recognition failures, with another occurring during a Wallet loading timeout.
The same model has moved the infrared camera to below the top left corner to reduce the size of the Dynamic Island. Some users reported a pop-up stating "Face ID not available" during setup, or that enabling "Require Attention" still allowed access without direct eye contact. Some customer service representatives suggested exchanging the device, but others reported the issue persisted after the exchange; media speculate that it is more likely due to the iOS 27 software path not covering the "new sensor geometry + in-app challenges + first failure" scenario.
Parallel complaints include sudden touch failures, with some cases mentioning screen protectors, while others reported freezing when pulling down the notification center and control center simultaneously, which has also been linked to iOS 27. Apple's support page has stated that the TrueDepth camera on the 18 Pro series is located slightly left at the top and should not be obstructed in landscape mode, but the company has yet to comment on the restart issue.
The buyers are users who have just received their high-priced replacement devices, while the sellers are the system versions that have not yet released a patch. The driving force behind the incident is clear: the new sensor combined with in-app secondary verification is what causes the failure. Financial pressure falls on Apple's after-sales device exchanges and the scheduling of the next system version, while the beneficiaries are the software repair costs that have not yet been widely deployed, and the burden falls on the first batch of users who have locked Face ID with passwords and Wallet.
Analysis logs show panic-full records corresponding to the restart times. The expectation is that the fix will come in a subsequent minor version of iOS 27, rather than a full device recall.
Source: Public Information
ABAB AI Insight
Since Apple made Face ID the default lock for the iPhone X, it has repeatedly paid software costs on new sensors: mask mode, attention detection, and the Dynamic Island cutout all had hardware released first followed by system updates. The 18 Pro has moved the infrared module to the bottom left corner of the screen to reduce the size of the island, effectively dismantling and reinstalling the optical path validated over the past nine years. Historically, the first mass production of Touch ID, Antenna Gate, and the iPhone 13 Face ID conflict with screen protectors all follow the same pattern: industrial design leads, certification stack follows.
The capital path shifts certification from an independent cutout to the display layer, trading off screen-to-body ratio and price anchors. The 18 Pro is still priced within the flagship range, with even higher-priced dual-device forms above the Max. R&D budgets are spent on under-screen optics and a smaller island, while the software team must simultaneously handle lock screen, app lock, and Wallet authorization paths within the same release week. Suggestions to exchange devices will raise unit after-sales costs, but are cheaper than admitting structural defects.
Similar cases include the initial recognition rate fluctuations of Samsung's under-screen camera and Google's Pixel ultrasonic fingerprint misfires with screen protectors. The industry position is that certification hardware is transitioning from "visible modules" to "display layer integration," while Apple is still expanding screen-to-body ratio and has not yet achieved stable under-screen biometrics. Competitors use fingerprint or multimodal diversion for failure paths, while Apple ties almost all high-privilege actions to the same Face ID stack.
Structural changes belong to technological substitution. The lock screen path has been tested, but the in-app secondary failure path has not, indicating that the verification stack is split by interface rather than uniformly processed by sensor state machines. The mechanism is: when hardware geometry changes, failure retries become a new kernel entry; whoever makes biometrics a single point of dependency will have to pay a system crash tax every year with each new optical path.
ABAB News · Cognitive Laws
New sensors first change appearance, crashes occur on old paths
Single-point authentication turns a single failure into a full device shutdown
Exchange costs are lower than admitting incomplete structural testing