Has anyone figured out how to fix this problem?

I am using a Transcend 2gb SD card (not sdhc). It's not very old. Since installing the OS2008 beta, while listening to music (in various players) the music would stop all of a sudden and the files would disappear from the card. This could be solve by rebooting, but would eventually happen again.

I reinstalled OS2007 but the problem remained, so I moved all the files from the card to my computer, formatted the card, and moved the files back onto it. Same problem.

Is this similar to what others have experienced? Is the card toast, or can it be salvaged somehow?