Hello, My name is ***** ***** I'll be assisting you. I'm sorry you're having problems. In order to assist you, I need to ask for more info.
1) What specific device do you have here (it just says "Panasonic" consumer electronics)? Is it a TV? If so what's the full model number off of the back of the set?
2) What exactly happens to the color after 2-3 minutes, if you could please elaborate?