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thafa13
User level: Level 1 (4 points)

Apple Watch Ultra 2 repeatedly restarts – IOMFB Under Voltage (UVP) kernel panic


Hi,


I have an Apple Watch Ultra 2 that repeatedly restarts by itself. The Apple logo appears and the watch reboots.


The problem sometimes occurs when I lower my wrist and the display turns off, but it can also happen with Always On enabled and even while the watch is charging.


I initially had the issue on watchOS 27.0. I then installed watchOS 27.2 beta to see if it would resolve the problem, but the restarts are still happening.


I checked the Analytics Data and found multiple panic-full reports.


They repeatedly show:


IOMFB ERROR: Under Voltage(UVP) EVENT detected


and:


AppleMobileDispM11-DCP


I have the same panic signature in multiple reports from watchOS 27.0, and I have now received the same error again on watchOS 27.2 beta.


Has anyone experienced this specific IOMFB Under Voltage (UVP) kernel panic on an Apple Watch Ultra 2?


Could this indicate a hardware issue with the display/power system, or is it potentially a watchOS bug?


I can provide the panic logs if needed.


Thanks!

Posted on Oct 29, 2026 4:28 PM

2 replies

steve626
User level: Level 7 (20,243 points)

Oct 31, 2026 7:10 PM in response to thafa13

I think that is indicative of a hardware issue. But you need to get on the official latest version of watchOS because we can't discuss beta versions in Apple Discussions and if you still have a beta it isn't clear what irregularities that could result in. After clearing out the beta and installing the latest version of watchOS, which is as of this date 27.2, then you could report back if those symptoms persist or have gone away.

MrHoffman
User level: Level 10 (169,253 points)

Oct 31, 2026 7:22 PM in response to thafa13

Load watchOS 27.2, if you can.


The problem will likely persist.


This is probably bad hardware, and is headed for repair or replacement.


Once updated onto 27.2 (if you can) contact Apple Support.


Loading a beta onto unstable hardware is unwise.

Originally posted at discussions.apple.com/thread/256385597