Screen hooked up to Wii loses power at random times

http://dx.com/p/4-0-tft-lcd-monitor-for ... 12v-116284

That's the screen I'm using. I hooked it up to the 12v pins from the power plugin on the Wii's motherboard. Works fine except I fear when the Wii draws a certain amount of power, the screen loses its power. Reason being is because I was trying out SSBB and whenever my controller got a massive rumble, the screen would cut. It happened at random times during other games. Is there a better way of hooking up my screen to the wii?

Edit: I made a more secure solder connection and it seems to be fine now. I don't know much about soldering, but would a small solder connection really have caused something like that?
 
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