Spotify logs out automatically after a few days, losing downloaded music.

[iPaq]

Plan

Premium (Family)

Country

Australia

Device

Laptop

Operating System

Linux Mint 19 (Tara)

Release
spotify-client/tara,stable,now 1:1.0.80.480.g51b03ac3-13 amd64 [installed]

My Question or Issue

Opening Spotify has a seemingly random chance to completely ignore it's .cache/spotify and .config/spotify paths to ask me for sign-in credentials as if I've never used the software. Those paths exist and are populated with many Gigabytes of downloaded music for later listening.

No reboots, same graphical session but all saved music and my login session have 'vanished' in the eyes of the program.

I recently reinstalled the Spotify apt repo and Spotify itself however this has happened again today 😞

Any ideas?