I just bought an iPad retina about a week ago and have only charged it twice. But when i do charge it , the iPad BARELY charges. Im running on 4 hours and im at 28 Percent. From what i have read on line there may be a recurring issue with this. I just called tech support and they danced around the question a little bit. Have any of you heard of this before? if so, should I return the ipad for something else?