Got banned, really confused!

Not sure what happened, I just finished a game of swat and I got a message saying “The banhammer strikes” and now it says I’m banned from arena. What happened, I didn’t do anything wrong.

you game history doesnt go back veryy far but it shows that you had a dnf 2 games back if you have left during games multiple times you will get banned

I got kicked because I got 2 betrayals due to splinter grenades and got booted. That must of been it because it let’s me play now.