I have a Sphere moving around inside a cubic room. I use rb.MovePosition to move it from keyboard presses, the walls are typical Cube objects with Box Collider. I checked freezeRotation for all 3 axes, and my Sphere has a Physic Material with 0 friction. When I move the Sphere to the very corner, so it touches all 3 surfaces at once, it gains some drift, i.e. when I'm not pressing anything, it moves slowly in a single axis. My code/setup is so simple, I'm guessing this corner-case has happened to others before. Any ideas?