Problem with download of audio files

I have been having trouble with the accompanying audio file not downloading when doing a lesson. Even some of my older audio files have disappeared and I had to try and re-download them. It can take days for this to happen. This problem started about two weeks ago. Any advice or anyone else experienced something similar?

What exactly happens when you try to download the audio? Can you please be a bit more specific, are you referring to download audio button on the lesson page?