To play via Spotify connect you must have a Spotify Premium account

Please try the following :

Within the app Home>Settings>Devices ....Show local devices only make this green slide to the right to turn on

1. Download the latest firmware/Software
2. Clear the Spotify Cache (in settings Menu)
3. Close down other apps you're not using 
4. Restart your device 
5. Restart your WiFi Router  (turn off 30 seconds and turn on)