Lg G2 D802 facing problems after upgrading to Kitkat....

Hello everyone!
I have LG G2 D802 Kit Kat 4.4.2. No Root, No recovery.
after upgrading to Kitkat its touch got crazy, sometimes it stopped working.Knock On, status bar are not working also. Battery is draining too much. What should i do??
Plz Help me out
Thanx in advance!!


Front facing camera and the notification LED

While Snapchatting, I discovered any time the notification blinked (and the front camera was on), there was a 'hardware filter' applied to the camera feed displayed.

Is this a bug, I don't know!! Looks like some build quality issue to me.
Can it be fixed? I hope so
(

Code:

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if frontCamera.isOpen => notificationLED.disable();

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:D:D:D )