iMac 27 late 2015 auto restarts sometimes when it is iddle

Hi there,

I believe we need to proceed with an EtreCheck report. EtreCheck is a useful app to diagnose issues, both hardware and software. It is trusted by many users. Please follow the steps outlined below:

1. Go to the Mac App Store and search for "EtreCheck."
2. Download it. It is a free and trusted app; as it is on the Mac App Store, and only trusted apps can be submitted.
3. Run the report, and put it in a post, as seen here - https://discussions.apple.com/docs/DOC-250000211. We will then examine the report for issues in your Mac.
4. Open EtreCheck, then go to the name "EtreCheck" in the top left corner > "Preferences" > "Privacy" > turn on "Allow Full Access to Startup Drive."

Also run Apple Diagnostics -  Use Apple Diagnostics to test your Mac - Apple Support Please post the Reference code when done.

Please post results of both!

Cheers,

Jack

You've got quite a list of external devices, I'd unplug them all and test to see of the panics persist. If they stop add them back in one at a time and test each one for a time to see if you can isolate the problem.

It looks like you’re also running two different fan control applications, you should look into that. Also make sure that the third party utilities you're running are all up to date.

Again, I have the same iMac, I never let it or put it to sleep because of sleep/wake issues like kernel panics. If you haven’t you should at least try that as a test.

FWIW I've stopped sleeping my iMac entirely, too many sleep/wake issues in the last few versions of macOS. I do set my display to sleep after 15 minutes of inactivity.

Have you added ram to this iMac? Do you let or put the iMac to sleep and it panics in sleep or when you wake it?

Yes, sorry. I just updated my guide.

I couldn't agree more but until Apple gets it fixed we do what we have to do.