aside from your connection fluctuating, maybe you have reset a password on your facebook account if you are connected through facebook. all you have to do is log out and log back in your spotify account.
try logging out and back in again
This works only once. I use Spotify for Windows Phone and it keeps telling me that I'm offline when I'm not.
The Programmer did a poor job of creating the platform, creating stress for you.
I am having the same problem. I have never changed my Facebook account. Spotify USED to play through my Sonos system. Must be time to close my Spotify account as I am also paying monthly for absolutely nothing ! Thanks for previous comments.