Two different combo breakers. One stops excessive looping from the AI and player, which is the one we were discussing above.
The second one stops the AI from getting as many cascades as the player. This gradually decreases as you progress through the PVP ranks, making the chance of getting lucky more even between the player and the AI.
Please be aware that there is a difference with these between our platforms at the moment. By the time Mobile and Console receive the new update, everyone will be on the same playing field and there will be more consistency.