Why do I get banned in Arena for quits in Warzone?

I was ready to go to sleep and call it a day when I was banned for 9 hours from Arena, but I decided to play some Warzone. First game, whole teams gives us surprise butt sekts and when I see the leaderboard, they’re all in the same group (every single one). So I obviously leave the game telling myself: “I’ll just wake up tomorrow and get on Arena because the ban will be done by then”. Well, tuck me I got banned for 24 hours from Arena for leaving Warzone! I am thinking hard right now whether or not to even keep Halo 5 in my house for this dumb crap. Please though, why do you get banned from Arena for quitting in Warzone? And why can’t you get banned from Warzone? I’d much rather be banned from Warzone.

Might have been a glitch. that’s never happened to me.