ITunes sometimes freezes during backup phase of syncing

Usually every day or two when I plug my iPhone in to my Mac to Sync (ios 4.1, iTunes 10) it hangs during the backup phase - even if I leave it for hours. I then disconnect the iphone and shut it down but it hangs when it shuts down (just a spinning wheel). I then force restart it and then it syncs with iTunes and but at the end says it was unable to back it up. I then unplug it and plug it back it and then it syncs and backs up fine again. As I said this doesn't happen everytime I sync my phone but usually once in 4-6 syncs. Any ideas on what might be going on here? It has also happened to me once or twice on my iPad so am wondering if it might be an issue on the iTunes side.

This is exactly what's been happening to my iPad for the last month or two. Backups used to be very, very slow before I installed iOS 4.2 but now I have the same problem with a complete backup hang every 5 or so syncs.
I spoke to someone at the Genius Bar when I was there for another reason the other day and he said it was likely to be something to do with photo syncing but I wasn't clear exactly what aspect of photo syncing was causing the problem. Anyone got any ideas?

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