mobile

I got my phone on Wednesday (4/8/15) and everything was perfect with the phone nut as of last night (4/9/15) noticed that camera was not rotating and it was kept on landscape, and also applications like youtube would not automatically rotate from portrait to landscape. I verified the screen rotation setting and it was on, did a factory reset and nothing. Called Samsung and no help there they don't know what the problem is. Went to an AT&T store and they could not find the root of the problem, so they are trying to get me a new phone. But while I wait I would like to see if there is a solution because if I can solve it (with help) before I get the new one I can cancel that order. Any one with same issue or knowledge of how to get it fix? please help