Why does the top part of my Nexus 4 screen became unresponsive?

A

AC Question

Top part of my nexus 4 screen became unresponsive

Address bar in chrome works with double tap now not with single touch , also the Google bar on home screen works sometimes with persistent try. This all happened suddenly yesterday morning without any physical damage like fall or water etc. if I try to delete some shortcut I can't as screen unresponsive at top section and dragging stops when it reaches that section, I can still see the drop down notifications, tried previous questions but no solution yet.
 

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