[Plugin: SingSong] Song link keep disappearing

Hi,

I have an issue using this plugin. I typed the link to the song that i wanna put in background. It worked. Unfortunately, after a few days, the link is gone, and the song is not playing in my blog. I re-entered the link again, and it played. Somehow, the same problem is repeating. Could anyone please take a look on it? Does anyone has the same issue?

Thanks,
Shyuan