iPod & Bose or Dock - Music Stops

[twister]

I have a 20 gig iPod that does photos and music. It works great, however if I try to set it on the dock, and then use the line out in the back of the dock to my speakers, it'll only play for about 90 seconds and then it'll go silent, but the iPod will continue to play.

Now I just got a Bose SoundDock for Christmas and it's doing the same thing. I have complete control over the iPod via the Bose remote, but after about 90 seconds, the sound goes out. The iPod is still playing and the remote still works, but no sound.

My iPod software was recently re-installed and it's all up to date.

Any ideas? on what might be going on?