New Apple Watch models could restart randomly, & watchOS 27.0.1 fixes that bug
AI-summarised brief · reviewed before publication
Apple released watchOS 27.0.1 on Wednesday, just over a week after the rollout of watchOS 27.0, to address a spontaneous reboot bug affecting the Apple Watch Ultra 4 and Apple Watch Series 12. Users reported unexpected restarts while editing watch faces, making calls, using Siri, navigating Maps or the App Store, recording workouts, and even when the device was idle. An Apple forum post traced the issue to a Neural Engine timeout: a command lingered for 2,020 ms, exceeding the 2,000 ms limit and triggering a reboot. The update resolves the problem but includes no disclosed security patches or CVE entries, indicating it is a pure stability fix. watchOS 27.0.1 is available only for the 2026 Ultra 4 and Series 12 models and can be installed via the Watch or iPhone Settings apps.
💡 Why It Matters
- · Fixing the Neural Engine timeout restores reliability for premium Apple Watch users, preventing disruptions during core functions like calls and health tracking.