Where is the proximity sensor located?
Try knocking just above the LG logo at the bottom. Seems more reliable for me.
Settings>Lock Screen>Select screen lock>None
Started me wondering why more of us don't simply bypass the lockscreen. Most of us swipe anyway to get to our Home Screen, so why even go through the lock screen step?
This...
I have to test more thoroughly, but this and the "tap and hold (gently)" gets my success % near 100%.
I love this freakin' phone.