If it’s just me then it’s just me, but if it’s anyone else too, I’ll put this in the Support forums.
After many of my Arena games, it will say something like “not retrieving data” at the end of the match, but I’ll never actually lose connection or get booted out or anything. I’m hoping this does’t mean I’m not getting credit for completing the game.
It’s happened to me a few times, and one time it affected my friend’s placement matches, so they weren’t counting. He backed out and went back in and they started counting afterwards, but four matches or so were null and void for him. So you’re not alone in this.
This also happens to me time to time and it’s very frustrating not getting rewarded for a win, or even still getting xp. 343 please look into this and fix it.