Try click here in google.
It seems as if this is a data transfer problem, because the image gets its self sorted at the end.
If you have it a short time warranty or or a part pay replcement may see you right.
Contact Canon with the full story.
Lack of memory may be another possibility
System detial would be useful to us.
One more thing what is the software you are using for imaging?
Have you tried another?
click here. and click here are two excellent free download programs to check this out on.