I’ve had playlists disappear from my library and no I didn’t delete them

[ethanpierce12]

I noticed that at least 3 of my playlists vanished from my library. I was pretty upset as they were playlists that I listened to regularly. I checked if I could recover them and the playlists aren’t there. 

Plan- Student plan

Premium

Country

USA

Device

Iphone Xs 

My Question or Issue

Is there any way I can find out why they just vanished and if I can recover these playlists?

[Ellielou57]

My playlist is gone and I've tried everything?? Help!!!