Ouch! Sorry to hear man. Can you at least return it?
5 machines in a row is easily the highest number I've seen yet... As someone passed this on to me earlier this year, I'd contact Craig Federighi. 5 Machines in a row should qualify as an issue worth his time: email@example.com
I've had 3, I've posted in this thread somewhere around a year ago. Apple doesn't care but an email doesn't hurt.