iMac has started shutting down by itself

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Level 2

222 points

iMac has started shutting down by itself

My iMac has started shutting down, when not being used, possibly overnight.

It had a completely new installation of Catalina about 2 months ago.

This is the top of the error message:

panic(cpu 1 caller 0xffffff80172a2d1c): Sleep transition timed out after 180 seconds while notifying applications. Suspected bundle: com.apple.iokit.IOSCSIArchitectureModelFamily. Thread 0x365c0.

Failure code:: 0x02807530 00000011

Does this mean anything to anybody?

Thanks.

[Image Edited by Moderator to Remove Serial Number]

iMac 27" 5K, macOS 10.15

Posted on Feb 16, 2020 3:31 AM

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Answer 1

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Barney-15E

Level 10

122,306 points

Feb 17, 2020 5:55 AM in response to IanMetz

You don’t have any third-party kexts installed, so the next most likely cause is hardware. If you have any external devices connected, disconnect them before sleep and see if you still get panics.

If it still panics or you don’t have any external hardware, it may have an internal hardware fault. Take it to an Apple Store or certified repair center for evaluation.

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Answer 2

IanMetz Author

Level 2

222 points

Feb 27, 2020 10:17 AM in response to Barney-15E

Well, thanks for the suggestions!

What worked for me was unticking all Energy Saver boxes, leaving it like that for a week or so, then reselecting the 'Default' settings.

Back to normal now. All external drives and cables unchanged.

Fingers crossed!!!

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Answer 3

Barney-15E

Level 10

122,306 points

Feb 17, 2020 6:34 AM in response to IanMetz

It can also be a cable causing the problems.

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Answer 4

Barney-15E

Level 10

122,306 points

Feb 16, 2020 9:07 AM in response to IanMetz

Does this mean anything to anybody?

No, but the rest of the panic log might help figure it out.

Paste the text of the panic log into the Additional Text area here (Document icon).

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Answer 5

IanMetz Author

Level 2

222 points

Feb 17, 2020 6:24 AM in response to Barney-15E

Thanks for that... I normally have 4 x external SSDs attached, and maybe a couple of HDDs, so yes, I'll try ejecting them and see what happens.

What I don't understand is the iMac never shuts down when I'm using it. So, I've today changed the Energy Saver settings so nothing is checked, and the display goes off after 10 minutes - effectively keeping the iMac and all drives awake 24/7.

(Incidentally, the reason for so may drives being attached is they are doing an initial upload to Backblaze.)

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Answer 6

IanMetz Author

Level 2

222 points

Feb 17, 2020 3:03 AM in response to Barney-15E

Thank you Barney.

It did it again last evening so I've pasted both reports...

iMac shutdown

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iMac has started shutting down by itself

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