Devices Menu disappeared on iOS

[user-removed]

There's no devices menu when I open an app. I can reach them via the Control Center and then they appear in the app. iPhone 7 Plus, iOS 10.3.1, Spotify version 8.4.0.623

What could be an issue? Already restarted the phone, the speaker and the WiFi router and reinstalled the app – didn't help.

Here are some screenshots

[user-removed]

The problem is solved by logging out of the account and restarting the iPhone. Thanks to the Spotify Support.

[user-removed]

this is kinda strange but devices menu disappeared AGAIN from the bottom of the screen and I can access my speaker or AirPods only via the control center.
why is this happening???
i also noticed, that devices menu appears when the Spotify app is working on my Mac.