DSS 80 auto sleep broken?

I have a Microsoft Digital Sound System 80 that's about 2 years old. All of the sudden they started sleeping in the middle of playing games and music. I never had this problem before, but now it has become annoying.

I don't use the USB software, straight analog from my SB-Live!

Anyone else have this problem? I remember some people here complaining about the same thing when they first came out.