sm g7102 touch misbehaving

Hi ! I m new here i need some help ...the touch of mý Samsung galaxy grand 2 dual sim sm g7102 misbehaving from last 2 months .... the problem is while using suddenly touch stops working and i just restart 4 to 5 times its working again it happens so many times in a day .... i installed its new android software kitkat 4.4.1 ...2 times ...but this problem not fixed. ... please somebody tell me the solution...

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