Game kicks me out in the middle of an arena match

I was in the middle of a match when the game suddenly exits to the opening screen with the message “the game has refused your connection, try again in a couple of minutes”. I was still connected to battle.net and my internet is normal. The game did not crash, I was just booted. After a couple of minutes it opens again and shows my arena rewards… so infuriating to lose a good run because of that.