Spotify stops numerous times. The phone & app is up to date but still music stops whether youre using offline or online. You need to turn on your phone then the music continues.
I would recommend checking your Sleeping application list to see if Spotify is listed. Sleeping applications prevent applications from running in the background when the screen is turned off, which sounds like what you are experiencing.
You can locate by searching your settings for "Sleeping Apps"
Hope this message finds you well!