Hellos guys, I have a MacBookPro (13-inch, MID 2012), and I had the same problem, today I decided to go to an apple store and they told me that on these macbook models it is very normal for this to happen, (Factory error), then his response was: "We changed it for a new one, it does not matter that you no longer have any guarantee of the product, and will have no cost." So I recommend that if your case, approach the nearest Genius Bar, and fix the problem in less than 15 minutes.

Best regards