I win a match in the arena and give a lose

When I win the third match in the arena, the loser counter was 3 and I lose de arena.
I need help please. Thanks

Did you disconnect at any point, especially during the match finding step? There is a sticky post on this forum about common issues:

This post links among other things to this article:
https://us.battle.net/support/en/article/17276?blzcmp=app

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