Random Crush on Mac

I am playing on the Mac. Sometimes it doesn’t crush for hours and then when I try to change some settings it starts crushing after 10-15 minutes of that change. Other times when I close the application and try to open it again it starts crashing. Also, this happens when I try to test my deck on the AI sometimes as well as for some reason, I can’t change the setting on the extra rule section when I try to play with the AI.