When we watch our insignia television anything red in color looks as if it is jumping or quivering...why is this?

This sounds like you are using a composite, S-Video, or RF cable input.

The quality of these inputs are not as capable as component or HDMI, so colors are not separated as well. Red is a color that saturates heavily and will cause bleed as well as dithering...especially intense colors (bright green, bright blue, bright yellow, bright red).

To reduce this visual annoyance you would need to soften the video output from the player (not easy to accomplish), or upgrade to a better cable connection.

Hope this helps!