Same here. I have it constantly, especially on mobile net. And mobile is working fine. I am writing this, surfing YouTube and all but Spotify doesn't work properly.
The problem is that because it thinks it is offline, you can't browse music. You can ONLY listen to songs you have actually downloaded. It is terrible.
The only way to get rid of this is to to shut it 5 times or so (just closing the app once won't shut off spotify) or to to the settings and force it to stop and shut down. It will work for a session and then come back with the same issue.