27" iMac 2020 turns off Bluetooth during sleep after switching users

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27" iMac 2020 turns off Bluetooth during sleep after switching users

For the past month or so, my iMac has been spontaneously turning off Bluetooth during sleep after switching users, so that when I try to wake it up the next morning, I can't. I have to plug in an old USB mouse and plug in the Bluetooth keyboard to one of the USB ports on the iMac, as though charging, then I can log in and turn the Bluetooth back on.

I'm running macOS Big Sur (11.6.4) on an iMac Retina 5K, 27-inch, 2020 model with the Intel Core i7 processor, which I purchased new from Apple in March 2021, so it isn't even a year old yet. Rebooting didn't help. I've also disconnected the power cord for several seconds, which supposedly resets the PMU, in case that might help, but it didn't.

Would anyone have any ideas as to how to correct this bizarre problem? Should I consider upgrading to macOS Monterey? I've read about compatibility and speed concerns with that OS and Intel processors, so I've been hesitant, but maybe I should bite the bullet.

Thanks!

iMac 27″, OS X 10.11

Posted on Feb 23, 2022 6:03 AM

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Answer 1

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PRP_53

Level 10

84,751 points

Feb 23, 2022 6:44 AM in response to Dan Ringuette

Personally, wth this issue unresolved - would Not upGrade to Monterey at this time.

The existing issue may carry over into the new OS and further frustrate the user ( you ).

1 - Suggest restarting in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.

2 - Does the issue present in this mode ?

3 - If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.

4 - If the issue is present in the dummy account - then this appears to be a System Wide issue.

5 - Suggest downloading the Application Etrecheck directly from a well Respected ASC Contributor. And Safe to use.

The application is free or paid from added features.

Run the application with Full Disc Access ( Security & Privacy - Full Disc Access ).

It will take a Snap Shot - both the hardware and software.

The Report will Not Reveal Any Personal Information.

Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )

We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.

Any Third Party Applications that will interfere with the normal operation of the OS, alter, modify, remove or delete or attempt to do so is an invitation for disaster and may require a Reinstallation of the OS.

This includes AntiVirus, Disk Cleaners, Disk Optimizes, UnInstaller etc.

This will include CleanMyMac

This will include BitDefender

This will included Norton Antivirus

The The Built in Security is all that is required.

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27" iMac 2020 turns off Bluetooth during sleep after switching users

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