Could it be the DVD player, perhaps? It's something worth testing out.
--HDTech
I have a Samsung TFT-LCD television (Ln-T1953H) and the color becomes red and dark after watching DVDs for about an hour. I change the color preferences but these don't hold. This only happens with DVDs. Any ideas?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic