When I charge my HTC One M7, it goes into landscape mode. Why?

So all day my phone is just working fine then I put on the charger since I needed to charge and suddenly the screen turned into landscape mode and its bugging me. I cleaned the port with a needle to get all the lint out still nothing. Please help

Even when you hold it vertically? If not, then the position sensor is suddenly realizing that the phone is lying down when you plug in the cable. My Samsung does that about half the time - lay it down flat and it sometimes goes to landscape mode. Flat on its back isn't vertical or horizontal, so a difference in placement of the sensor by a micron or two may affect that.