Excerpts from Elektron support related to my issue. This is what I found out and is most-likely why I am getting crashes. I use FUNC+Save Proj as I work, and pretty much do it without thinking about it.
There is currently an issue with the quick save (FUNC+Save Proj) in which the machine can freeze like this. (We are working on fixing this bug - luckily, the Project will save successfully even though it freezes, but regardless we are of course fixing it). To avoid it, save by pressing the Settings (cog wheel) button, and select Project - save project from there.
Hope this helps someone here!