I just started syncing my iphone to my iMac instead of my laptop. Now every time I plug in my iphone to the imac, it takes a long time to sync. It seems itunes is slowly copying over 300 songs to the iphone each time. I have nearly 2000 tracks syncing to the phone. For some reason, it looks like the same 300+ tracks are being copied every time I plug in, as if they were new tracks. Has anyone else experienced this? Syncing usually takes a minute or two.