Just purchased ipad. Love it, love it, love it! However (there's always a however), the volume control (down only) doesn't work. I can up the volume, but can't turn it down. Now, for apps that have an on-screen slider for volume control, that works fine. It's just the volume control on the side of the unit. Known issue? Or just bad luck on my unit? I plan on taking it back to local Apple store this evening, but just wanted to see if there might be a known solution that I can try first. Thanks.