AppleAHCIDiskQueueManager problems
I had an SSD put into my 2015 iMac last year and now that has crashed. Unlike a crashed rotating disk, the computer still thinks the SSD is there, but it just can't read it. I've been running from an external disk while waiting for my new Mac Mini to come. My iMac runs fine but I'm periodically having reboots with the "AppleAHCIDiskQueueManager::setPowerState ... timed out after". Error. I've run diskutil from terminal and have completely unmounted the SSD. I've even ejected it after it was unmounted, but I'm still getting these errors.
Disk Utility app says my external boot disk has no errors.
What can I do to prevent this "AppleAHCIDiskQueueManager"
Thanks in advance for any help you can offer.
iMac 27″, macOS 12.6