I went to apple store today for the same problem, warranty expired, the guy from genius bar sounded more like a salesman. Without even checking my iPad told me it may need to be replaced (same Generation) and that would be $300.00. ...or getting the iPad mini for the same price. That make me upset since my iPad has retina display, cell antenna and 64GB. Bought less than 2 years ago. I wonder if you paid the same for your replacement, or was less or more.
Thank you for your reply
I would also like to know what happened as the exact same thing happened to my mums iPad 3! Luckily it was still in warrenty so she got a new one but low and behold, the same thing is happening again! And not it is out of warrenty. Is this a common issue with the iPad 3 I wonder? It definetly a hardware issue.