Why does the Sony Ericsson Vivaz Pro touchscreen not working when it's cold?

I have one problem with my SE Vivaz pro. He's touch screen wont work when it is cold (outside), but soon as I warm him up or put him near something thtat blows warm air, touch screan works again? How can I solve this problem? Tnx

You can't fix it. All resistive touchscreens doesnt work when its too cold.

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