LG L246WH goes blank when using component input

[screenlicker]

I'm using my 24" LG with Wii. When playing over component cable the display goes suddenly blank after 20-30 minutes or so. The time is not really fixed... sometimes it takes more. This is extremely frustrating.. In the middle of playing the picture just disappears... Sound is not affected, so it's definitely the display.

If I want to get the picture back, I have to change the display's input manually to HDMI/VGA and then back to component.

This only occurs with 480p.
LG's model is L246WH-BN.

Any ideas? Is the component input faulty?