Occasionally my phone, Moto G4+, will read that I’m pressing or tapping the screen, which makes it difficult to use my phone. It’s typically on the right side of my screen, as far as I can tell when I have my keyboard up. I’ve tried cleaning the screen, and turning my phone off and on again, but they only work temporarily.
I would contact Motorola support if you haven’t already done so. The Moto G4 does have some touch screen issues. How wide spread these issues are, I don’t know.