Does WatchOS kill apps when in extreme temperatures?

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Created May ’24

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I have noticed that my Apple Watch app seems to randomly quit from time to time. It's not crashing and I have not been able to reproduce it in a controlled setting, but have noticed that it seems to only happen when I'm in very high or low temperatures. For instance, I was skiing recently and my app was supposed to stay running the whole time, but often when I would raise my wrist it would be back on the home screen and my app wasn't running. This also happened when I was on the beach on a very hot day. But when I'm testing it at home I can keep it running for hours and it never crashes, which leads me to believe it may have to do with the temperature. Does the OS kill apps when it's running in very high or low temperatures? If so, is there anything I can do to prevent this from occurring?

Would doing less things in my app possibly prevent this? For instance, I have a timer, and use a bunch of sensors, would turning those off at times and using less of the display make a difference or does the OS not care what the apps are actually doing? If not, any other ideas?

Thanks

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Answer 1

Frameworks Engineer OP

Apple

Jun ’24

If you haven’t already, take a look at the crash report for your app if there’s one present. To find the crash report, see the “Acquiring crash reports and diagnostic logs” article, under the “Locate crash reports and memory logs on the device” heading.

In a crash report, the 0xc00010ff (“cool off”) exception code indicates that the operating system terminated the app due to a thermal event. Improving your app’s performance, especially its power consumption, can help avoid this kind of termination.

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