I have probably the same, occasionally.Does anyone have problems with the touch on your screen ?. sometimes when I'm using cell stop responding certain parts of the screen. like a lag but it is not because other buttons work . I would like to know how I can fix this. I have D850
But, more weird, for me just happens when keyboard is active (both with LG keyboard and Google's, so didn't seem an app problem), and just with the back button, and only with phone laying flat on a surface.
Some times (not often) the back button doesn't work (the rest do), but just taking phone not horizontal makes it work again.
Difficult to trigger (just very few times), so no log... And it's so easily solvable (just move the phone for a moment and is gone) that don't bother me. But it's annoying, that's true, cause I can't imagine what's triggering that.
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