Why does my itunes keep crashing?

Everytime i plug my iphone in to sync new songs (even tried syncing over Wi-Fi) it just crashes… Then when it finally worked, it automatically deleted more than half of my songs. Now i can't get it to work at all… Help?

I got a similar problem with my ipod touch 4
when i tried sync, it will freeze on either determining tracks to sync or waiting for sync. What i do is i copy all the photos from my ipod to my computer, it works about more than half of the time for me.
If that doesn't work then you can try restoring it, but that takes forever.

Just wondering, when did you get that problem, i got it after i updated to ios 5.

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