Why do my headphones stop working on my LG Android?
After THREE YEARS of searching for a fix... I think I just found a solution - and felt obligated to spread the information. Just plug the headphones in slowly... That's actually all there was to it... The notification icon for a plugged in audio jack at the top of the screen will show up differently if you did it right.

This reddit post: https://www.google.com/amp/s/amp.reddit.com/r/LGG3/comments/2siwyp/is_there_a_rom_or_fix_that_makes_g3_detect_all/  the user RandomGenera7ed  tells us to plug the jack into the headphone plug slowly - causing it to show up as a three prong headphone jack and not a four prong jack (four prong jacks have a mike wire that can have pause/skip/volume-change/GOOGLE VOICE functionality while three prong audio jacks do not).  Apparently plugging a three prong jack in too quickly confuses the phone into thinking it has a four prong jack plugged in.