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Peterson50Flag for United States of America

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Mac mini 2018 freezing with no warning

Have a 2018 Mac mini which was working fine for some time (32GB ram) all of a sudden it started freezing, screen was frozen although mouse would move.  I ran the Apple Hardware Diagnostic and it found no errors, I attached a copy of the screen. I only have it connected to a keyboard and mouse and wifi and monitor.  I've been slowly removing items that are at startup. Any other items I can check.  It freezes once every day.  One day it was fine all day and was frozen in the morning when I sat at it.  Any other items I can check.  This is my little powerhouse.
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Peterson50
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BTW it is running Catalina 10.16.7 I'm not moving to Big Sur yet
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David Favor
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2 quick things to try first.
Reset the SMC, then Reset the PRAM.  Sometimes these will fix these type of issues.

If that doesn't work, boot into recovery mode and reinstall the OS.  This will replace the OS system files and fix them if they've become corrupt.  Make sure you back up your data first, just in case.  Reinstalling the OS does not destroy your data, if you don't go to Disk Utility to erase the disk first.  It should only reinstall the OS with the current OS files for your existing OS.
I have reset the SMC and PRAM with no results, running top now for the next day to see what happens, if it continues will do a reinstall as a last resort.

Thanks

Running top via remote ssh.  I uninstalled Malwarebytes from the Mac mini and it has been running for 33 hours with no issues.  I have about 10 open apps running at the same time along with streaming (a transformer cartoon, somethings I still like) and it appears fine.  Perhaps Malwarebytes was the culprit although I have it on my MacBook Pro and that does not lock.  
I usually just use the free version of MalwareBytes and scan on demand, rather than run it realtime.
Glad you got this working!