Hello
Nope this is not 50 playlists. The problem is the number of titles in a playlists.
I did a mistake in my first topic. The number is 100 titles and not 50. This is not a limitation of Volumio but of the Spotify plugin.
You may have more than 100 titles in a Spotify playlist, but the Spotify plugin for Volumio report only 100. There is also a bug: if you zap from one title to another, you have strange behavior.
If you have a big playlist with more than 100 titles. The only way is to split it in Spotify and build several sub-playlists with only 100 titles in.
Hope i am clear now 