The touchscreen on my Samsung Tocco isn't working?

I have a Samsung Tocco Lite which is about 6 months old but whenever I press a command on the screen it does nothing. I was just wondering is this a common fault with these phones and is there a way I can fix it? Like I said, it's about 6 months old, it's not been dropped or had anything spilled on it, it just started doing this last night!