Apple Releases watchOS Update to Fix Unexpected Restart Issues on Smartwatches

Apple released watchOS 27.0.1 exclusively for Apple Watch Series 12 and Ultra 4 to fix unexpected restarts, including during calls, workouts, and other tasks. Reports traced the problem to a Neural Engine command exceeding its timeout by 20 milliseconds, although Apple has not detailed the underlying cause. The update has no reported security fixes, and Apple recommends affected owners install it. Users can install it through the watch’s Settings app or the connected iPhone’s Watch app; the watch must be on its charger and have more than 50 percent battery. Separately, watchOS 27 introduces a dynamic app grid that puts six frequently used or recent apps up front, with the full app collection one tap away.
The restart bug did not affect every Series 12 or Ultra 4, but some owners said their watches rebooted multiple times a day.
Owners also reported restarts while editing watch faces, using Siri, or opening Apple Maps and the App Store.
The unexpected reboots were concerning because users rely on the watch for alarms and medication reminders, as well as health monitoring and fall detection.
The Series 12 and Ultra 4 launched on September 18, and reports of the reboot problem began appearing online soon afterward.
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