We just put our christmas tree up, so I decided to take some pictures of it. Everything was working fine, and then I layed down under the tree to take some bokeh pictures. I noticed some large black chunks in the eye piece, but nothing on the pictures and then when I sat up, they were gone anyways. I thought it was just the strap being in the way /me going crazy. So i took some more pictures, and things were fine. I took one at 11:26:59 and it came out fine. I took one at 11:27:01 and it was just BLACK. I didn't change any settings, or anything.. it was black. I took another; black. Another; black. Switched the lense; black. Took another; black. Uploaded to computer; black. Tried again; black. Randomly tried again; I can see the picture, but a corner of the bottom right hand side is black. Just a diagonal section of the corner. I didn't notice it at first, but going back through the pictures it happened right after it started showing the pictures instead of just all black. I tried blowing out any dust or anything, but I still have the black section. I didn't drop it or anything of the sort, it just STOPPED WORKING. Any suggestions for why? I'm going to call the store tomorrow and see if they know anything, and then if not take it in on Monday if I get a chance. I only got the camera at the end of October, and I do have a warranty but I just don't get what the problem is. It's a Nikon d3100 by the way. Thanks.