This is what happened to me,i click rankings,then clicked the swords to battle.Nothing happened,so i decided to spend 60 stamina in the lab.Clicked the 1st monster square.Now the fight battle i clicked just before i entered the lab decides to work.So i skip the fight,As soon as i skipped it,i get teleported to the the end boss and fails to sync.Refreshed and 60 stamina gone