Distortion scan like thing problems with Olevia 747i

I have the Olevia 747i, I just purchased it a month ago. I tried calling tech support a couple of times, but their support isn't the best and they keep telling me to take pictures, but the distortion occurs so quickly that I can't seem to take a picture.

Anyway, whenever I have a source connected to the HDMI or component hookups, every so often there will be a really quick flash of a horizontal white line across the entire screen. This happens when I'm hooked up to my TV or watching ONdemand with Comcast Cable. When my XBOX360 is hooked up, it has a red line that does the same thing.

The strange thing is, when watching ONdemand, the white lines seem to occur at the same point in a movie every time. Which led me to think it was just the cable box or something. But then it happened with the computer and 360 hookup.

I have not noticed it when watching live TV.

Anyone have any clue what this might be?

EDIT:
Here is a pic I finally managed to capture with my camera phone, as well as a youtube video of it.
http://s254.photobucket.com/albums [...] 8_2137.jpg
http://www.youtube.com/watch?v=e2m9o58c4mQ