They lost there people who supply there servers. They said they are looking for new providers and when they find one they will go back to providing a streaming service
I tried ClassicsOnline for a few months a couple of years ago. Once I got my streaming issues straightened up with my ISP, I truly enjoyed the quality and selection. But I had to decide between Tidal and ClassicsOnLine and Tidal won. Promised myself to re-up when I could afford and now it looks like I’ll have to go in a different direction.
Really, really enjoyed the service and music while I had it. I should add that I am not a classical music buff by any means. I first listened to Holst and Sibelius on ClassicsOnline. For that I'm grateful.