Due to the Spotify API limit (number of requests we can do to Spotify API) and the launch of Spotify in Russia (and the announce of Google Play Music shutdown), we got too many users moving to Spotify right now. To handle that and continue to have a great user Soundiiz experience, we are limiting the number of batches we can do in same time (the 105 error).
So if you have this error message, we recommend you to simply try again later and if you can, during the day instead of the evening (as there's more people using Soundiiz after the day work). We hope to be back to a normal situation in the future.
Thank you for your understanding.