Wow, thanks. Finally success in comment #28 which shows amdgpu kernel
errors and then:

Nov 10 11:45:58 blaise-vivo gnome-shell[1908]: amdgpu: command stream overflowed
Nov 10 11:45:58 blaise-vivo gnome-shell[1908]: GNOME Shell crashed with signal 
11

So it sounds like the problem is originating in the kernel driver:
amdgpu


** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- [amdgpu] Screen freeze
+ [amdgpu] Screen freeze with AMD/ATI Renoir

** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1900777

Title:
  [amdgpu] Screen freeze with AMD/ATI Renoir

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