I just picked up a used Panasonic PT-AE700U projector and I noticed that when watching a movie the colour of the faces of people chnage colour slightly when they turn or move. It goes from redish to bluish/greenish when they move around.

Is this normal with this projector? Or is there a setting to correct it? I am using the Cinema 3 setting and watching the DVDs on a HDMI cable connected to my Xbox 360 (non HD). The projector says it has 770 hour of lamp use, so is this an indication I need a new one?