Ubuntu 19.10 freezes regularly (Dell XPS 13 9343)
From the comments...
To slightly re-tune your system, we'll make adjustments to your swap, and see if that helps.
reduce swap from 16G to 4G
set vm.swappiness to 80 (60 is the default)
sudo sysctl -w vm.swappiness=80 # make more use of swap
sudo sysctl -p # use the values from the current sysctl.conf