Lg g3 touchscreen don't recognize taps but it works perfectly in some conditions

Sorry for my English but i'm italian...
I Bought an lg g3 d850 6 months ago from a hong cong seller on ebay
it has worked perfectly since a month ago i woke up and i seen that touchscreen didn't recognize taps in 90% of cases but recognize perfectly long press (in 100% of cases) and it's already a strange thing
i searched everywhere for a solution but i didn't found anyone with my same problem
i was about to resign myself but i discovered that....
i don't know how to explain
i attach a video from youtube to show you
www.youtube.com/watch?v=eTXAkmLlyCA
please help me i can't buy a new display and i don't want to throw my phone....

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