Apple Watch Series 12 and Ultra 4 Owners Report Unexpected Reboots
Owners of the new Apple Watch Series 12 and Ultra 4 are reporting unexpected reboots that appear to be linked to the Apple Neural Engine. Diagnostic logs indicate that the Neural Engine hangs for approximately two seconds, triggering a firmware watchdog that forces a kernel panic and restart. Apple has not yet acknowledged the issue, which has been reported by around 30 users on MacRumors forums and other platforms.
- ▪Diagnostic logs from affected devices show the Apple Neural Engine hanging for about two seconds before a firmware watchdog triggers a kernel panic.
- ▪The reboots occur during various activities such as using Siri, editing watch faces, or making calls, and have also been reported when the device is idle.
- ▪Approximately 30 owners have reported the issue on MacRumors forums, with similar complaints appearing on Reddit and Apple Community Support.
- ▪The problem persists on both the original watchOS 27.0 build and the day-one update, and has occurred even on replacement units.
- ▪Apple has not yet publicly acknowledged the widespread reboot issue affecting the newly launched watch models.
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| Publication time | Mon, 21 Sep 2026 09:08:51 +0000 |
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Apple Watch Series 12 and Ultra 4 Owners Report Unexpected RebootsMonday September 21, 2026 2:08 am PDT by Tim HardwickSome new Apple Watch Ultra 4 and Apple Watch Series 12 owners are reporting their devices rebooting unexpectedly, and diagnostic logs suggest the crashes are related to the Apple Neural Engine. Reports have been posted in the MacRumors forums since the new models launched on Friday. Users describe their watches suddenly displaying the Apple logo and restarting while they were interacting with the device, doing things like using Siri AI, editing watch faces, opening Maps or the App Store, starting phone calls, and recording workouts. Some reboots have even occurred when the watch was apparently idle.
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