Any time I unplug my iPhone from my laptop, all music and video is wiped off it and it just says "You can download content from iTunes". But when you plug the phone back in, all the music is still there on the iPhone and you can play it from the iPhone on the laptop. You just can't access it on the laptop. I've taken the iPhone into the Apple Store and they told me there was no hardware issue and I should reinstall iTunes on my laptop. I've done that yet this is still happening. Any clue?