I have the same issue
I am in canada with telus
my phone was never rooted, I never dropped it, it just have this problem since day one
Telus send it 2 weeks ago to LG for a fix
It came back today saying that my phone was fully working that they only did a factory reset
so I made a video of my phone trying to go home from the telus store and came back to telus saying sorry its not working and I showed them the video.
So My phone is gone to LG again
Let see what happens