Cayin N5 II
Cayin v3.6 firmware (based on Android 5.1.1)
In Spotify version 184.108.40.2065 hardware buttons (Next, Previous, Play/Pause) on the player stopped working while the screen is locked though they still work on the lock screen and with the screen on. I have tried rebooting the device, reinstalling Spotify and enabling "Device Broadcast Status" in app settings but the issue still persists.
On my Galaxy S8+ navigation works normally.