It only started after I took a character through the Galaxy City tutorial. I played for several hours with no issue prior to this. But now after just a few minutes the game crashes, and kills discord at the same time. I ran the rest of my characters through the hero tutorial with no issue.
My system is a little older, and have had crash issues on other games, but they're usually much more modern games.
I am going to try reinstalling, to see if that fixes anything, because that is the only thing I can think of to try and fix it on my own.