Changing Storage Locations

[matt6500]

Plan

Premium

Country

United States

Device

Samsung Galaxy Note8

Operating System

Android 9.0

My Question or Issue

This has happened several times while I've had this phone, but it's gotten to the point where it's doing it at least once a week. I'm not sure what the trigger is, but at least weekly now, I'll turn on Spotify and it will have changed my storage location from my SD Card to my phone and begins downloading ALL of my music again (around 4,000 songs at this point on spotify) and it doesn't allow me to switch back to my card until I stop the downloads by going into offline mode, and switching to the SD Card. At which point it deletes all of the data that was already stored there (I see the amount of available space goes back up after I switch) and I have to redownload my entire library again. It's becoming very annoying as I've paid for premium for years now, and not having ready access to my songs offline is very inconvenient where I work as I don't have much signal and mass downloading on wifi is discouraged. 

What could be causing this trigger and how do I stop it? Is this an issue in your app?