There's always the notification 'authentication error' which ruins my experience. I've been playin this for a while now and I noticed that the notification always pops up at the center of the screen ruining my gameplay. Even when the song is still playing, it pops up and it cuts off my combo. I tried linking it with the cloud save and it even also says error. The problem is solved when I turn on my wifi but the wifi consumes battery faster than when I'm offline. Pls fix this and I will rate 5*.