One question... When saying you are investigating the problem, did you also mean you will fix it when you found out? I do not see why we should pay premium when you do not try to fix simple problems like this at all...
The problem is not solved yet.. I'm having the same problem with the same phone model. Spotify freezes everytime i press the option or the menu button. Please fix the issue very soon. You cannot keep on ignoring the issue especially with you premium subscriber.
So I find a solution about our problem with Xiaomi and Spotify dots. I downloaded an old version of Spotify and works. With all features . Connect with other devices playing music in offline mode but has the old menu. It's temporary solution till Spotify or Xiaomi fix the problem .
Yes this worked for me to however it's missing one key feature for me - the ability to make homescreen shortcuts to playlists. I usually fill up screen full of playlist shortcuts on a homescreen for quick access. Hopefully this issue is fixed soon.