It is not playing when I off the screen.

[propanoicacid]

It always closed otomatically when I lock the screen. I don't have Power Saving or another saving applications. It's annoying. What should I do to solve the problem?
(Reeder P10, Android 6.0)

[Joe]

Please check out the thread [COMPLETE GUIDE] How to fix most Android issues which should help.

[propanoicacid]

I had done all of them before I posted there but they were not working

[Joe]

MIUI has a pretty savage power saving mode but I assume you turned that off. It's not the app but your phone is suspending spotify when it is running in the background. Have you tried seeking help in the MIUI forum?