That is not a malfunction.
The liquid crystal panel controls the light and shade of the display image by changing the orientation of liquid crystalline molecules by an electric field.
A certain amount of time is required to change the orientation of a liquid crystal molecule by an electric field, and this amount of time differs depending on the individual LCD Panel technology.
Therefore trailing images are seen with a fast movement of the picture. This is not a malfunction. Since the speed (response speed) to change the orientation of the liquid crystal depends on size of liquid crystal molecules that LCD uses and the manufacturing technology, it is difficult to improve this symptom in this model.