Some internet radio not working

@support, any idea why e.g. this link is no longer working in internet radio:

I can play the link in my browser, but roon says:
“Roon could not find a radio station at this URL”

In the logs:
“09/15 09:27:27 Warn: [internetradio] Invalid non-stream channel URL []”

Clicking the link in a browser, I got a few messages about the maximum number of connections reached. Other times it plays without problems.

I had a few problems adding it to Roon as well, but finally it went through and is playing well:

My best guess is that there are intermittent capacity problems at the streaming URL.