Spotify Connect: loses devices and change volume

[oelcito]

Playing from mobile phone (Motorola XT1040),  Spotify Connect loses remote Android device (Samsung SM-T210) connection after pause, when remote Android device (Samsung SM-T210) is in screen off mode or Spotify App is running in background. Remote device appears like “not available for playback”. Morover, it is not posible change volumen  in remote Android device (Samsung SM-T210), from from mobile phone (Motorola XT1040).

Using Spotify Connect with Windows 7 client as remote device, none of these problems occur.

Can anybody help me?

Thanks in advance

Regards