Reports keep coming that the iPhone 18 Pro and Pro Max, released on September 18, suddenly shut down and restart mid-use.

Posts appeared in Korean communities from September 19, and the same symptom has been reported on overseas forums. Users call it panic-full, after the name of the record it leaves in analytics data.

A screen cutting out mid-use and coming back on A screen cutting out mid-use and coming back on — Source: concept image · self-generated with agy

How the reports spread

How the iPhone 18 Pro panic-full reports unfolded How the iPhone 18 Pro panic-full reports unfolded — Source: self-rendered from combined reporting

iOS 27 was released on September 14 and comes preinstalled on these devices. The devices launched on September 18.

Reports started on September 19, and Korean coverage followed on September 20. There is as yet no tally of how many units are affected.

Apple logo Apple logo — Source: Apple

When the reboots happen

  • Right after Face ID authentication fails several times in a row
  • Opening “Recently Deleted” in the Photos app
  • Using face recognition while logging in to a banking app
  • Launching Apple Wallet or Apple Pay
  • Nothing special at all, such as watching a video

Stretches that involve entering something protected by Face ID come up repeatedly. Whether that is the cause, or just a heavily used stretch that makes reports look concentrated, is not yet confirmed.

Overseas, someone posted that their iPhone 18 Pro Max rebooted four times within a day of purchase.

What panic-full means

A kernel panic is the core of the operating system stopping itself when it reaches a state it cannot continue from. Rather than keep running in a bad state, it restarts the device.

That is why the screen goes dark, the Apple logo appears, and you end up back at the lock screen. It is a different kind of event from a single app quitting.

At that moment the device writes the state it stopped in to a file, and the file name begins with panic-full. That is why users call it panic-full, and finding this record is faster than describing the symptom in words.

How to check whether your device has one

Settings > Privacy & Security > Analytics & Improvements > Analytics Data

The list is sorted by date, and an entry beginning with panic-full means a reboot happened at that time. Opening it shows the time of occurrence, the device model, the iOS build, and a string pointing to where it stopped.

You do not need to interpret the contents. What matters is that the record exists, and when you report the symptom to a service center or Apple Support you can send the entry with the share button.

If there is no record at all, an app may have quit or the screen may have frozen briefly, which is hard to treat as the same problem.

What you can do now

With no confirmed cause, there is no certain fix.

Keep the records

Note the dates of reboots and what app you were using, and keep the analytics data entries. They are your evidence when dealing with support.

Keep backups

A reboot does not itself erase data, but until the cause is confirmed, having a backup is better.

Check your seller’s exchange and refund window

There are reports of service centers offering exchanges and of refunds at the Apple Store. Windows and conditions differ by seller, so if the symptom recurs it is safer to ask within the window.

Apply software updates first

If it turns out to be a software problem, an update will be the first remedy.

Precedent and open questions

Right after the iPhone 16 launched in 2024 there were similar reboot reports, resolved by the iOS 18.1 update.

Apple had made no official statement as of September 20. Nothing has been announced about whether this is a software bug or a hardware problem in a particular production batch.

Summary

Summary of how to respond to panic-full Summary of how to respond to panic-full — Source: compiled from this post · self-rendered

Sources

  • [Financial News] Watching YouTube when the screen went dark and rebooted — iPhone 18 Pro panic-full reports mount (2026-09-20, symptoms and log path)
  • [Asia Economy] iPhone 18 Pro panic-full two days after launch, reboot reports at home and abroad (2026-09-20, overseas cases, the iPhone 16 precedent)
  • [MoneyToday] iPhone 18 Pro reboots right after purchase, Apple silent (2026-09-20, Apple’s position)
  • [Seoul Economic Daily] iPhone 18 Pro users report sudden reboots, some get refunds (2026-09-20, exchange and refund cases)
  • [Hankook Ilbo] Unexplained reboots mount on the iPhone 18 Pro (2026-09-20, how the reports unfolded)