I consistently experience (over a period of several weeks) occasional crashes.
If it makes you feel any better, I experience it several times a day… on Monday it got to a point that I took several days (three and counting) break from Pharo because I was so utterly frustrated by this…
My rough observation is that this happens when working with visualization.
Do I do something wrong, or are there some issues?
There are (at least) three different crashes that happen often… two related to Athens/Roassal it seems (one you reported is one of them) and one related to fonts. Of course I reported all of them, but with no known way to reproducibly crash it, I seriously doubt it will be fixed anytime soon.