This error is occurring on a 2017 Macbook Pro 13" Retina operating OS X Catalina 10.15.1.
Any time I pause play on Spotify and resume after an extended period (anywhere from 5 minutes onwards), Spotify persistently gives me the 'cannot play this song' error (which appears as the blue bar on top of the application). Changing songs does not fix this, neither does changing playlists. The only solution is to restart the app.
Previous topics from a few years ago on these forums have asked similar questions and one proposed solution is to disable hardware acceleration in the settings; this does not fix the problem in my case. Neither does enabling or disabling crossfade.
Thanks in advance for any help!