I am having some issues with one of my iPhones and iTunes. It doesn't want to work very well with WiFi sync. I have another iPhone 4 that work fine. -iPhone 1 has issues, it often disappears from the left panel of iTunes. It will not sync when plugged in. When I manually try to sync from the phone, it hangs on looking for iMac. This has happened when iPhone 1 was an iPhone 4 and continues to happen after upgrading iPhone 1 to a new iPhone 5. -iPhone 2 is an IP4 that has no issues syncing to the same iMac/iTunes. I would rather NOT do a full restore on iPhone 1. Is there anything you could think of that would cause this to happen? I'm at my wit's end trying to figure this out.