Seems many people are having an issue with the Knock On feature. I am also; Knock On no longer works - I can Knock Off but not Knock On. If I press the power button to turn the screen on it flashes on then goes black again - I have to press it about 4 times at just the right length of time for the screen to come on. I am also having an issue (started the same time) with the screen going black when I answer or make a call; makes checking voicemail impossible. I turned on the "disconnect call when the power button is pressed" however that doesn't work - won't even reboot if I hold the power button on. Needless to say this is also a HUGE issue. I have did the "draw lines on Notebook" test and have no dead spots on my screen; I did the "turn Knock On off - reboot - turn Knock On on" and the other suggestions on this site with no results.
Now I have always loved LG products but I've only had this phone for 10 months and I'm NOT pleased with LG or Verizon at this point.
Verizon - what are you doing about this?