Tablet dropped down - touchscren does not work correctly.

Hi there,

I dropped tablet from 1m and the lower half of the touch screen does not work correctly - the response is random. Upper half of the touchscreen seems to be OK. After drop down two touch buttons (Recent Apps and Back) also did not worked at all but I squeezed a little bit the lower right corner of tablet withh fingers. After couple of minutes the buttons started working again correctly.
What can be a problem with the touchscreen? Is it uncalibrated only or just broken for good? Can it be a problem with wiring? Shall I try hard reset?

Any help will be appreciated,

Regards
Ziggy

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