iPhone 5 touch-screen problem!

Hi guys

I have a problem with my iPhone 5, you get the story from the start.

Thursdag 4th of October i received my brand new iPhone 5. I unboxed it but the fun-factor was short. After an hour of surfing on the web the screen started to show some kind of pink "flicker" on the screen. I just thought that it was some kind of software error so i continued playing with it.

After 10 minutes i putted the phone on standby, and after 20 minutes i returned to use it again, but the touch-screen was dead. I tried to restore the phone with iOS 6, but it didn't help. I walked down to the store again and made a service case on it.

Then Thursday 11th of October i received a new iPhone 5 from service. I wen't home and started using it and everything worked just fine. The next day 12th of October the screen started doing the same thing as the first phone. When i surf in App store sometimes the screen flickering in a pink color.

The touch screen on the new phone is not dead (Yet), but would it happen?

Do anyone else have this kind of problem?

Kindly

Mathies