So this is what I have noticed. When it comes to PVP or any event, when players are fighting and the other player is about to lose they leave the game which makes the game lag then they will lag back in then once more the game will lag which makes the other player can't combine or level up any hero and in the end lose. I'm saying this as it has happened to me a lot. You guys should just make it permanent if the player leave the battle that's it no second chances cause it's really frustrating.