Spotify disappearing from the notification screen (ANDROID)

[MNC1]

Hey when i use spotify on my samsung S9 the app stays on the notification screen on the top left (same line as the time) (As seen on the screenshot here) but as soon as i pause the music, lock my phone and wait 10min a "spotify has closed" message appears and the app disappears from the notification screen and i have to restart it. I would appreciate if you guys have a solution or workaround for this. Thanks!