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