This phenomenon may occur when the image contains a very bright subject, such as the sun, spotlight, or a reflected light source. This phenomenon, called smear, is specific to CCD imager technology, and is not a malfunction.
Generally this does not affect the recorded images. However, movies or panoramic images sometimes may be affected. It is recommended not to directly shoot a strong light source such as the sun.
NOTE: The image below shows the example of smear phenomenon. It may look different depending on the shooting conditions.