Songs suddenly unavailable on my spotify in my android

[Melaniaangelial]

Hai, I'm from Indonesia, and have spotify premium for months now. I listen to Swords and Magic by Taeyeon just a few days ago. But suddenly, when i want to listen to it yesterday, it's gone from my playlist. And when i go to the settings to check the "see the unavailable songs", the song is there but i can't play it. It said the song is unavailable. And a few of Girls' generation songs also appear unavailable suddenly. How can i fix this? Thank you