I bought my Nikon D5200 on August 15th, and it was working fine until December 16th. After using the camera and finding that images were coming out blurry in auto mode, I tried manual mode, and it was working pretty well. After that one day I took a photo in auto mode with the focus using AE-L button and found the lens motor working. Then I took a photo in remote mode using ML-3, and found the camera focusing automatically. My half press does not show focus, what do I do now?