Please double check your credentials, clear the cache, exit and rerun Kodi, run the addon and report the results.
If everything's okay, wait a few days and do the same thing, and report back.
PS: I'm working on an update, I will fix this issue if it reoccures.
Thanks in advance.
This is a very simple feature to implement, but I still don't see the need for this. This is a radio addon and not a player, and its API won't support request for selection or even searching for songs. It simply deliveries a random list of songs based on your played history, so if you don't like...