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I've read about others with the same problem on this forum, and in that case there was some dirt between the border and the screen that pressed on the touchscreen. This caused the touchscreen to think that it's already pressed, and thus won't register any more touches. So check if there's any dirt under the border along the screen.
Of course, it's always possible that the touchscreen is broken, in which case you should contact Sony for a replacement.
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