Samsung galaxy s7562 Touch screen behaving improperly

I have recently replace the touch screen digitizer with new one. It is behaving improperly. The device is reading and responding to touches even if the screen is not touched, strangely this happens when 2G network is enabled. Works fine if mobile data is disabled or when 3G network is enabled. When this problem occurs (Device starts taking touches automatically) the deveice will be unusable. Please help me out gyus