Rotation problem iOS 8.3

Hi, I have an iPhone 6 Plus and ever since updating to iOS 8.3, I've been experiencing all kinds of problems with the rotation function of the phone. For example, all the photos taken by the camera are viewed upside down, all photos viewed in Twitter are all upside down, the phone won't rotate even though it is unlocked. I tried restoring the phone twice already and the problem is still persistent. Is there a physical problem with the gyroscope? is it a known issue with the new version of iOS? what should I do? Thanks.