It happens most on 2x speed (pvp speed), it’s harder to do it on 3x speed but it happens often. As you can see, the cause is when you open a new window when a enemy monster enters the field. Whether it’s “yes/no” window or “you can only use this move once” window, or even opening reinforcement. You can probably see from the video this happens with throw teams billion of times because all sacrifice moves have a “yes/no” window and i have to check reinforcements if i have rockoids to throw. When you do this bug in pvp the battle freezes and you have to close the app and open it again and reconnect if you wanna continue.