Mopidy Discourse

Problem streaming from URL

Hi,
for years I am running mopidy on a internet radio without problems. Recently, Deutschlandradio changed the URLs and now its failing (Unsere Streaming-Adressen im Einzelnen) Adding any of these addresses to the playlist fails with:
WARNING [StreamBackend-5] mopidy.internal.http Download of ‘https://st01.sslstream.dlf.de/dlf/01/128/mp3/stream.mp3?aggregator=web’ failed due to download taking more than 4.995s
Any idea how to fix it?
Nils