[Q] can't touch anything

hello.. everybody
i'm newbie here

please help me...
i have a sony ericsson type st15i or experia mini

i have a problem with this phone
i don't know why...
if i turn "data enabled" on...
i start my browser and not long after...
i can't touch anything and it press the back button automatically
if i lock the screen and i want to open my screen i can't slide the "unlock" button

please help me to prepare

note:
i have update my android to the latest version from sony ericsson
my guarantee card has gone

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