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Apple Watch Series 12 and Ultra 4 Owners Report Unexpected Reboots

Summary by MacRumors
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.

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A chronic problem has begun to be reported with Apple's newly introduced smartwatches. The watches are unexpectedly restarting themselves.

·Istanbul, Türkiye
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Apple Watch Ultra 4 and Series 12 users are facing a serious software crash that causes their devices to constantly restart. The problem, which is said to originate from the Neural Engine and doesn't resolve even with a factory reset, has prompted users to await an explanation from Apple.

Since their launch on Friday, several Apple Watch Series 12 and Ultra 4 owners have reported unexpected restarts. Diagnostic logs shared by some users point to a Neural Engine timeout, without the exact origin of the problem being established.

Released on Friday, September 18, the Apple Watch Series 12 and Ultra 4 reboot on their own from some users. Diagnosis logs point to the Apple Neural Engine, the AI dedicated circuit of the new S11 chip.

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MacRumors broke the news in Glen Allen, United States on Monday, September 21, 2026.
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