All too often -- and always without warning or discernible action on my part -- the material on the screen greatly expands far beyond the edges of the screen. It seems to me that this occurs when my hand is on the mouse, even only touching it (not moving it, R or L clicking, or...). I am unable to return to normal size. If I'm on a website I can often back-arrow < to the previous screen, but > only returns me to the enlarged page. I've changed batteries in the mouse, been careful about how I maneuver it, but still cannot solve this. Advice?