error 500 on create playlist

[mm126]

using the endpoint 

https://developer.spotify.com/documentation/web-api/reference/#endpoint-create-playlist

sometimes (50:50 chance since few days) throws a error 

Post "https://api.spotify.com/v1/users/userxyz/playlists": http: ContentLength=78 with Body length 0

even the body is filled properly with name, description etc.

anything changed on spotify backend? or any idea how to stabilize this again?