I have no problems setting up my Wiim Mini and my Echo Dot so that I can ask Alexa to play BBC radio 4 and playback will begin live playback. But once playing, if I the say “Alexa, ask BBC sound to rewind live radio 30 minutes, the Wiim goes silent. This works fine if Alexa is configured to have the Echo Dot itself as the speaker, not the Wiim.