I'm at a loss...I would have to guess, only guess..that there is a problem of some sort with one of your hard drives or the RAID setup itself.
I don't have any real experience with RAiD or problems of the type that you seem to manifest...I suggest that you await some inputs from those members who do have such.
In the meantime...you might run diagnostics on the hard drives (individually).
Bootable Hard Drive Diagnostics - Vox -
http://usasma.vox.com/library/post/bootabl...iagnostics.html You have no other system anomalies, at any time other than those specified in your original post?
Have you checked Event Viewer for any indications of controller/hard drive errors?
How To Use Event Viewer -
http://www.bleepingcomputer.com/forums/topic40108.html Louis
Google Links, Synch Problems with iPods
Edited by hamluis, 27 August 2010 - 04:17 PM.