I got banned

I play halo 5 a lot. today I played a game of infection and then the game kicked me out because it said my fireteam had changed, the ban lasted for 9 minutes. Then 30 minutes later I played another game and the same thing happened but this time the ban was 20 minutes long! why does this happen? I didnt quit the game myself and no one joined or left my fireteam!

Something, something place ban questions here

It also looks like you’ve quit/DNF’d two other times today playing fiesta.

I’ve wondered, what’s dnf and how do you look at that?