Post bugs here, please try to make sure your bug is not already reported thank you.
Try to include as much information as possible;
Did you use the skip crystal, what statuses you had, when an effect played during that turn in battle, i want as much as you can tell me because if i dont know how the bug occurred i dont know how to fix it.
If youre using an old save thats possibly the problem, like the game description says thats not going to be stable most of the time.