Hi all, I received my new base model 2012 13" Air with 8GB RAM upgrade last week. I've been pretty disappointed. It has frozen several times where I've had to shut it down and one time it got gray and a message poped up and told me I had to shut down due to some failure. Also, I leave it to sleep during the day and when I come home and open it, it has lost around 5-10% of its battery! Then I proceed to use it with no keyboard back light and the brightness below 50% while browsing the Internet and it loses one percent about every other minute! Please tell me something's up, as this is my first Mac and I'm not impressed at the moment. Thank you for your time.