Currently Being ModeratedMay 15, 2013 5:41 PM (in response to roseste)
It might be your SIM. My brother has a 13" Air and a friend of mine has the same model with this issue. The SIM is the piece that manages power in the unit and it sometimes malfunctions so it will get confused on how much power goes to what parts. I don't think it can ruin the unit entirely but take it to the Genius Bar. And make sure it can stay cool. I'd suggest getting a lapdesk since the Macs are so enclosed compared to my Dell Inspirion 15.6 inch it can release heat faster than a Mac in my mind.