Ha good luck. Mine had the same problem and is currently (since Monday), not in my possession as it had to be sent back to Apple for "repairs". In the meantime I was charged $30 for a loaner.Take it to the Apple store and they will exchange it.
My roommate is on his 3rd iPhone due to this same issue.
Im having this exact same issue....What did u do 2 fix it? It was working fine a few hours ago.The top half of my iPhone's screen isn't responding properly when I touch it. Would I have to send this to Apple for them to repair it, or could I just exchange it for a new one at the store?