Apple Watch Series 12 Unexpected Restart, Kernel Panic

Hello, I’ve just bought my Series 12, one day ago, a couple minutes after i set it up, the watch suddenly restarted, something seemed wrong so i went to check diagnostic logs, there, a panic-full file was talking about a timeout in the Neural Engine, specifically:

ANEHWDevice::ANE Timeout: channel=DataChainingCommand... waited=2020 ms, timeout=2000 ms, fANEFirmwareEnablePanicOnTimeout=1

This happened yesterday, and today as well, a few hours ago. Running the latest build of watchOS27, I am curious to see if anyone else has this issue, or if anyone can bring some help!

Apple Watch Series 10, watchOS 27

Posted on Sep 19, 2026 3:27 AM

26 replies

Sep 20, 2026 11:13 PM in response to Sputerman

I also have this issue on series 12

Sputerman Author

Level 1

34 points

Sep 21, 2026 3:04 AM in response to Sputerman

https://www.macrumors.com/2026/09/21/apple-watch-series-12-ultra-4-reported-reboots/

We have our first news coverage, hoping it gets to Apple as soon as possible and tells us what is wrong

Sep 21, 2026 3:09 AM in response to Baris24

Does it resolve the issue cauz I am having the same issue

Sep 21, 2026 5:42 AM in response to Ingo2711

Interesting. Same thing for me on my series 12. Was running yesterday and it reboot in the middle of that (but kept the workout going). Assuming it’s an iOS 27 issue.

Sep 21, 2026 5:43 AM in response to Sputerman

Where can we pull the log files from to send them in?

particle

Level 1

4 points

Sep 21, 2026 10:00 AM in response to Sputerman

Same problem here. Got my Ultra 4 today, installed 2 hours ago and got 2 random reboots already. It never happened on Ultra 1.

Fabris66

Level 1

0 points

Sep 23, 2026 1:16 AM in response to Sputerman

Two days, two restart…

Sep 23, 2026 4:11 AM in response to Ingo2711

Personally I have submitted bug feedback, twice, once for each workout crash. I was a little surprised you can’t attach logs but I guess that makes sense for initial feedback.