Song is not available

[MrDeepMind]

I was just listening a song which was already downloaded in my playlist that I created. The thing was, my mobile data was disabled.

While song was playing I enabled my mobile data and music stopped itself.

Then I tried to play it again the same song and it says the song is not available and it's now grayed out.

What kind of stupid issue is that? What kind of stupid software you guys doing? I don't wanna get mad everytime I want to listen some music man.