I've been hit by this problem so many times, the game freezes for over 10s. When it recovers, I'm down at least one extra bar and the opponent has a ton of characters in play. If any of my characters are still alive, they become completely frozen too. One time I played pope right before it froze, and it didn't even revive the last dead character.
This means guaranteed match loss. I lost 2 team wars fights because of this stupid bug alone, which is extremely frustrating. And keep losing rank because of this.
This bug started happening after the last game update. This makes me really not want to play anymore.