This issue appears to be related to Deezer’s servers, and we have already reported it to their team. If possible, we would also appreciate it if you could report the issue to Deezer on your side, as this may help speed up their investigation.
In the meantime, we have implemented additional error handling so that when a server-side error occurs, the player will automatically skip to the next track.
We have also pushed a new firmware version, 4.8.812044, to your WiiM Pro Plus.