Janai

I seem to be having some sort of problem with my new Toshiba TV. I have the V61. I just bought it the other day and hooked it up to my dvd player with component cables. My problem is that when there is some fast action or someone moves fast I can see some lines (like see the resolution lines on a projection tv) for just a sec then when the scene slows down it returns to a nice crisp picture. Does anyone have any thoughts on why it is doing this and if there anything I can do about it?
Thanks for any help.