Please tell us your entire current configuration of your Mac and include all connected hardware devices .
This could be something as simple as a failing cable causing electrical feedback or an USB hub sending an electrical signal that causes the instability .
Ok:
Mac Pro 2019
16core
Vega II, 192 GB Ram, 1TB
Connected are: Two Promise Pegasus Raids via TB3->TB2 Adapter
Lacie Little Big Disk2 daisy chained to one of the Raids, and a AVR receiver also daisy chained through TB2-> HDMI Adapter to one of the raids.
USB 3 Hub via USB A cable
Two Dell 5k Displays via TB3->Dual DP Adapter.
A Printer via USB A.
That's all..
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Ok I can try to do this at a later point when these projects are over, right now I cant clean install AGAIN.You should get macOS Catalina installed clean and working flawlessly before proceeding with anything. Do NOT import settings or use data migration if you're running into issues.
Run CCC to Clone #1.
Install one app OR migrate data. Check system drive.
If everything works, run CCC to Clone #2.
If data migrate caused issue, restore clone #1 and install apps one at a time.
Install another app or update. Check all apps.
If all works, run CCC to Clone #3.
Cycle between clone #2 and #3 over the next few weeks.
ONLY ONCE EVERYTHING IS CONFIRMED WORKING for 7+ days, then update Clone #1 as your MASTER. Put it away and don't touch it unless there is an issue.
Cycle clones between #2 and #3 on whatever interval you choose. The system drive on workstations rarely changes that much in a crucial manner and for many a bi-weekly update between multiple sources if sufficient.
Backup your media data in another manner.
I did that last night and didn't migrate any user settings...