Power button not working great

Never had any of these issues on any of the 4 Ive had. I just tested the power button and it works everytime on the first press. Having my phone on a surface doesnt seem to change its responsiveness either. Id be looking at an exchange if it were mine.
 
I've also had this issue from one seller, white european model. We tried another at the store and it had the same issue (of course they were offering to send it to an LG service center to let them decide if this is a problem - and they were also claiming that this is just how LG G6 buttons work, but I just returned it). I ordered another (silver, eu model) from another store and it works perfectly. I also checked an exhibited model at a T-Mobile store (it was quite hard to find any), but its button is also good.
 
I initially thought this seems related to the fingerprint sensor functionality being on the power button. It's almost as if there's a timing issue where fingerprint sensing interrupts the poweroff function in the software. But then I noticed that I get better response if I use a full finger press on the button compared to just my fingernail (I was trying to avoid fingerprint sensing), and even a pencil eraser works more reliably than my fingernail - so, is it a question of the button not being pressed "squarely" enough sometimes (which is exacerbated by having a case), or is it really related to fingerprint sensing (which gets confused by not having a large surface to sense)?

After many more rounds of button pressing, I am still leaning toward software rather than hardware on this, but I'm not sure.
 
I use it to turn on the phone and turn it off.. Double tap to wake/sleep ? Like dude buttons are so 20.st