Story thread · 5 reports / 3 sources

Apple Watch Series 12 and Ultra 4 Owners Report Unexpected Reboots

macrumors.com · 6h · first reportShare

Some 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. Notably, at least four owners have shared "panic-full" diagnostic logs showing the same Neural Engine timeout. In each case, the Apple Neural Engine appears to hang for around two seconds before a firmware watchdog triggers a kernel panic and forces the watch to restart. The problem has been reported on both the original watchOS 27.0 build and the day-one update that devices downloaded duri