ASUS Memo Pad HD7 Touch screen issue

I'm having a touch screen issue on my ASUS MeMO Pad HD 7. It works intermittently and when it doesn't, it does not allow me to unlock the tablet. Turning it off and turning it back on used to fix it but now it doesn’t. I reset the tablet and was brought to the initial setup page. I could not even do it now. Please help.
