Game constantly crashes randomly

Every time I try to play a game either it crashes sometime in the game at least once or in the startup, I'll get a black screen, freezes, etc. I have to force quit and try to reconnect. It has gotten to the point where it's extremely aggravating, I like the game but theres no way I can keep playing if I can't figure out a solution. I'm playing on a MacBook Air with good internet, I'm not sure what else it could be. Does anyone have any suggestions on how to solve this?

I appreciate it!