Are these local files or Spotify songs? I believe there is an issue where crossfade doesn't work on local files.
Have you tried reinstalling the app?
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thanks for your help. I already installed the APP several times. Playlists are offline stored on the phone ( I have 64 gb so space is no problem ). But again sometines it works but most times not. I have put crossfade at max 12 seconds but you can see he is not starting a new song for crossfading. It is a nice feature when it works and one of the reasons why I am using Spotify.