So, the day I got system update available notification (for 4.4.3), my pie control stopped working from bottom border. Just a coincidence I think. It was still working from other trigger positions though. I also had this incredible urge to see new update of Kitkat. So, I just got Google factory image of 4.4.3 & flashed it. Everything done, I got to home screen only to find out my navigation buttons are not working. That area is completely dead. Those buttons will randomly start working for some time. Only for a minute or so.
So I went back to the latest version of Liquid Smooth ROM. Pie control from bottom border & navigation bar is not working. Tried going back to stock 4.4.2 & take a 4.4.3 OTA. Still no go.
And to me, it seems a software issue since navigation buttons work in landscape mode. And the area where navigation buttons are in portrait mode also works fine for everything else. So, it's not as of that part of touch screen is dead.
So, to cut long story short, please help me out here guys!!!