Possible swap/memory problem.
BIOS
Your have BIOS version S1200SP.86B.03.01.0042.013020190050 dated 01/30/2019.
There's a newer BIOS available, dated June 2020, and it can be downloaded here.
Note: Have good backups before updating the BIOS.
Memtest
Go to https://www.memtest86.com/ and download/run their free memtest to test your memory. Get at least one complete pass of all the 4/4 tests to confirm good memory. This may take many hours to complete.
Update #1:
As I previously thought... you have swap problems.
You have THREE swap locations, as seen in /etc/fstab!
UUID="X-X-X-X-X" swap swap defaults 0 0
UUID="X-X-X-X-X" swap swap defaults 0 0
/swapfile swap swap defaults 0 0
Do sudo swapoff -a # turn off swap
Then comment out ALL three of the above lines in /etc/fstab.
It's never ok to completely disable swap. It's not appropriate to have too small of a swap. You have both problems.
Let's create an appropriate /swapfile for your system.
Note: Incorrect use of the dd command can cause data loss. Suggest copy/paste.
sudo swapoff -a # turn off swap
sudo rm -i /swapfile # remove old /swapfile
sudo dd if=/dev/zero of=/swapfile bs=1M count=4096
sudo chmod 600 /swapfile # set proper file protections
sudo mkswap /swapfile # init /swapfile
sudo swapon /swapfile # turn on swap
free -h # confirm 32G RAM and 4G swap
Add this line to /etc/fstab...
/swapfile none swap sw 0 0
Then reboot the system and verify operation.
If it all works, you can use gparted to delete the two disk partitions with the UUIDs shown in the commented out lines in /etc/fstab. Be careful here, and assure that you've got the correct partitions to delete. Then delete those three commented out lines in /etc/fstab.
Best Answer
From the comments...
You might check with AMD, as they had some Ryzen processor recalls due to Linux problems. See this bug report.
I looked at that lengthy bug report, and it looks like software solutions are all over the place... some with luck... some without. I'd contact AMD and see if they'll replace your processor.