Music Video Download Stopped - Error 54?

Hey everybody!

I was just downloading a music album the other day when all of the sudden several music videos (yes, several, you already know which album I downloaded, right?) stopped downloading after a few kilobytes/megabytes. The rest of the album, including most of the videos, went through without a problem.

I keep getting the following message when hitting "check for available downloads": "There was a problem downloading XY. An unknown error occured (-54). Please check that the network connection is active and try again."

Now my network connection is more than active. I also tried to flush the download cache (itunes -> Downloads) but there is nothing in it. So I wonder where the files might be cached since each of the videos that won't download has already been downloaded partially. Is there any way to reset the download?

What do?