Noise when The Smart Cover is closed.magnets are hit the ipad air's body

I bought an ipad air and a Smart Cover. On the same day, I noticed that the device had a sound when closing the Smart Cover. A sound like a *click*, I thought to be a magnet loose in the body of the ipad. I thought it was something normal about the device. After searching the internet and use my friend's iPad Air, I realize that was not normal. I went back in iPlace (authorized warranty) and they recommended me to go at Fnac exchange the device, because I'm still under warranty shop. All ok so far. I came home with a new unit and no noise. After a few days of use I noticed a dead pixel. Sad but okay. After research I saw that many users are having the same problem. So would not return to fnac so. (Not that I like dead pixels, but I read about costumers how had Dead pixels too and after exchanges ended with 2 dead pixels).

The problem is, the noise returned This night. When closing the Smart Cover, I hear a click magnet beating within the body of the ipad. It is strong enough to feel with my fingers. Important detail: When I open or closing the Smart Cover, it does not stick to the ipad until the * click * is heard.

The question I ask: is this happening to other people? Is that a problem? Or is normal in ipad air? I searched on the web and it is not normal! But I wanted a more technical view. Does anyone know about this?