After upgrading my D6503 to Lollipop (23.1.A.0.690) quick settings icons located in the lower half of the screen are unresponsive. This is very strange behavior, as the division line lays somewhere in the half of the first row of the icons under the WiFi and Bluetooth ones. Tapping the same icon above this "virtual" line works as expected, the same icon tapped only slightly lower doesn't switch nor make any action. This effectively makes the quick settings icons useless.
The same goes for the expanded notification bar: tapping notifications in the upper half of the screen works, notifications below do not react to any taps.
