My wife uses a Nikon CoolPix L820 and she is seeing an odd artifact in some of her photos (JPEGs). A horizontal strip of the image will be shifted to one side so that elements in the image do not line up properly. In the screen shot below, the two points "A" should line up as should the two points "B" - the lower strip has shifted to the left and "wrapped around" to the right. Also, in some cases a horizontal strip will just be blank, as at the bottom of this photo. This happens rarely, 99% of her photos are fine. Any idea what causes this, or how to fix it (other than laborious cut and paste in Photoshop)?