Spotify connect closes Spotify

[Trailhunter]

Hello, 

When i use Spotify connect on my phone and the screen  is swithed off,  after some minutes Spotify is closed (there is no lock screen app anymore and no icon in the bar). The music on my Sonos plays normal and when i Start Spotify again, the correct title ond Position is shown.

Only when i hear the music directly on the phone everthing is fine, Spotify lockscreen app an icon is shown every time. 

Whats the matter? 

HUAWEI gx8 EMUI 4.0.3 (android 6.0.1)

Spotify is in the apps thats not closed by EMUI whenn screen switched off (protected App)

Thanks