LG G4 US991 does not work knock on (double tap) - G4 Q&A, Help & Troubleshooting

Hello
Recently bought my LG G4 US991, and found that the function knock on (double tap) works very poorly
I can not say it does not work. It works through again
Need to knock several times in a row on the screen for the phone woke up
Who collided with this problem, and what are the options to fix this ?
Thanks very much in advance
Upd.
I read a topic LG G2 that might help me update touchscreen firmware
But there is described a method for LG G2
How to do update touchscreen firmware on my phone, LG G4?
I tried a combination *#546368#*991#
but they did not find touch firmware update

I only encountered this problem? Please help who know how to solve

Hard Reset is not helped fix the the problem (

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