The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →If your Apple Watch Series 12 or Apple Watch Ultra 4 keeps restarting on its own, install the latest watchOS update. Apple’s release notes for watchOS 27.0.1, dated September 23, 2026, say the update fixes “an issue where Apple Watch may restart unexpectedly.” Apple doesn’t publish a success rate or say what caused the bug. If restarts continue after updating, the next step is Apple Support or an authorized service provider.
How to install the fix
Apple’s wording in About watchOS 27 Updates is: “This update provides bug fixes for your Apple Watch including fixing an issue where Apple Watch may restart unexpectedly.” You can install it either way below. Apple says to keep the watch on its charger while it installs.
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From the paired iPhone
- Put the watch on its charger and keep the iPhone nearby.
- Open the Watch app and tap My Watch, then General, then Software Update.
- If an update is listed, follow the prompts to install it.
From the watch itself
- Keep the watch on its charger.
- Open Settings, then General, then Software Update.
- Follow the prompts to install.
Apple’s support pages cited here are its UK and Ireland versions. Screens and availability can vary by device and region, so go by the version your own watch or iPhone offers.
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What was reported before the update
MacRumors reported on September 21 that owners of both models described unexpected restarts. They happened during these activities:
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- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
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- using Siri
- editing watch faces
- opening Maps or the App Store
- starting calls
- recording workouts
- sitting idle, in some cases
Several shared panic logs reportedly showed a similar Neural Engine timeout. Some users said restarts continued even after they erased the watch and set it up as new.
Treat this as owner and log reporting, not as an explanation. Apple hasn’t confirmed a Neural Engine cause, and its release note doesn’t name an internal cause. No representative figure exists for how many watches were affected, so don’t read the reports as a percentage of owners. The note also doesn’t promise that 27.0.1 resolves every individual watch.
Rank #2
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
If the watch is frozen or stuck on the Apple logo
A force restart is a recovery tool for an unresponsive watch. It is not the software fix. Apple’s instruction is: “Press and hold both the side button and Digital Crown until the screen turns black and the Apple logo reappears, then release both buttons.”
Once the watch is back up, check for the update as described above. Apple’s page for a watch stuck on the logo also covers unpairing and pairing again, checking for updates, and getting service if the problem persists. That guidance is written for the persistent Apple-logo problem. It isn’t presented as a guaranteed cure for repeated restarts, so don’t expect a reset alone to settle this issue.
Rank #3
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41s72HIk5TL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
If restarts continue after updating
- Confirm the watch is actually on watchOS 27.0.1 or later, using the Software Update screen.
- Note when each restart happens, for example during a workout, a call or idle. Also note roughly when and how often. This helps support staff.
- Contact Apple Support or an authorized service provider. Apple’s support pages list service options and how to start a repair.
Third-party apps, accessories and replacement purchases aren’t equivalent remedies. The update is Apple’s documented fix, and service is the fallback.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Model and date context
Apple announced the Series 12 and Ultra 4 on September 9, 2026, and says Ultra 4 availability began September 18. The 27.0.1 release notes followed on September 23.
Quick Recap
Rank #4
![Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Blue/Bright Blue Trail Loop - M/L. Satellite Communications, Advanced Health & Fitness Tracking](https://m.media-amazon.com/images/I/51SKumOyv8L._SL160_.jpg)
- RUGGED AND READY TO GO—The ultimate sports and adventure smartwatch is built to last with an extremely tough titanium case and a strong sapphire crystal display. Water resistant up to 100m—it’s great for swimmers, divers, and fans of high-speed water sports.*
- A FULL-FEATURED HEALTH TRACKER—Ultra 3 can take an ECG* and check your heart rhythm for signs of AFib—right from your wrist. The smartwatch sends alerts for possible hypertension,* an irregular heart rhythm,* or an unusually high or low heart rate. You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and take readings of your blood oxygen.*
- ULTIMATE RUNNING AND WORKOUT COMPANION—A superior fitness tracker for marathoners, triathletes, mountain bikers, backcountry hikers, and mountain climbers, Ultra 3 provides precision dual-frequency GPS, Pacer, Heart Rate Zones, Custom Workouts, running power, Workout Buddy powered by Apple Intelligence from your nearby iPhone,* training load, and more.
- KEEP HELP CLOSE AT HAND—Ultra 3 is a smartwatch that can detect a hard fall or severe car crash* and automatically help connect you to emergency services and notify your emergency contacts. Check In can automatically notify a loved one when you’ve arrived at your destination.
- MULTIDAY BATTERY LIFE—Ultra 3 is a smartwatch that’s engineered to give you even longer battery life. It’s perfect for trail runners—with up to 42 hours of normal use and up to 72 hours in Low Power Mode.* Track a workout with full GPS and heart rate monitoring for up to 20 hours in Low Power Mode.*
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