We've been hosting the mp3 files on Amazon S3 and have heard from a lot of people having problems. Usually the download starts and then times out after a certain time, or the download just takes hours or days to complete after a certain amount.

The behavior seems specific to Amazon S3 and doesn't seem to be a deliberate attempt to censor our website, since it isn't targeting our private server at least.

We're planning to shift audio hosting to a dedicated non-Amazon server within a week or two, which will hopefully solve this problem for people.