I restarted in safe mode and that seemed to resolve it at first, but there is still freezing and crashing although less frequent (I did a clean install to begin with, so there was no migration process).
It just seems that the computer gets overwhelmed when performing some tasks. I can't pin it to a particular software, it can be Mail, Safari, whatever...
For instance, although InDesign and Zoom seem to work fine on their own, when I am doing a screen share on Zoom to show my InDesign document it can freeze. The person I'm talking to can still see my cursor move but for me the screen is frozen and it remains frozen no matter how long I wait for. Only a forced restart will do.
So there are lots of stressful things like that, especially if you're using it as a work computer... I have very fond memories of my 2014 MacBook Air now :{