This has been going on for quite a while now. My iPhone is always disconnecting or not even showing up in iTunes when I connect it to my laptop. I'm most certainly sure it's not the computer. Before, I thought that it was my computer's fault. I used to own a PC, but just got a MacBook Pro (mid 2012) today and tried syncing it. It backed up quite fine, however, when I went to sync my music, it disconnected WITHOUT any error messages. I've tried to sync it many times and the problem just continues. I've also tried restarting my iPhone, my MacBook, and iTunes. I've tried reconnecting my iPhone between the two USB ports. My iTunes is also the latest version as well (10.6.3). I'm not sure if I need to go change my iPhone or not. That is optional too because my warranty has not ended yet. Please help, it's very frustrating 