IPod Nano 16Gb sync error

For a while now I have been getting the following when I try and sync my iPod Nano 16Gb on my Mac.
The iPod syncs when it first is recignized by iTunes, but it will not synce again. I select different playlists, or make any changes. I tries resetting the iPod and now I have almost no music on it. It is three months old and useless now.
iPod cannot be synced. An unknown error occurred (-25172).
Any help would be appreiciated.

It does happen on both USB ports. I have used the original cable and one out of another iPod Nano box.
Both my Macbook Pro (OSX 10.6.8) and iTunes (10.6.1) have the latest updates.
I have tried both of my iPods, (16GB Nano and Classic 160GB), they will sync when first plugged in, but when I make music and playlist changes, then click the sync button they fail.
The 160GB will synce the changes to the playlists after I restart my system and iTunes, but the Nano had to be reinstalled completely and I cannot change the selected playlists, so it is almost useless now.
I will try and get to the Apple store next week. I read a couple of comments about this being a possible corrupt file. I have 160GB of music in iTunes, so not sure how to go about figuring this out.

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