Download error

[Ketsh]

Plan

Premium

Country

 Netherlands

Device

Motorola Moto G5

Operating System

Android 8.1

My Question or Issue
"Downloading has stopped because there is no space on the device."
I've always had hundreds of songs downloaded on my device.
I've used the application offline 2 hours,  and suddenly all my songs were set on "non-downloaded". I've tried reinstalling, clear cache, clearing data, manually deleting the com.spotify map in my files but nothing has worked. This was the only reason why I chose for Premium and if the offline feature doesn't work then I have no further use paying for this service.