Can't download offline music anymore

[user-removed]

Hello, I have a premium account, but for the last 2 days everytime I'm trying to download offline music, it saves and download but when I close and opened the spotify app, they are not downloaded, I have to redownload the album and it does the same thing over and over. All of my previous saved music is okay, I can redownload them without any problem. Any idea ?! 

Thank you.

[user-removed]

I forgot to say I've deleted the cached, uninstalled and reinstalled the app 2 times already. Same thing.