Rogue Camera Movement

Whenever I am playing with locked screen, I will move my mouse to the corner of the screen to move the camera to where i want it. However, multiple times per game (to the point that I cannot play) the camera keeps moving in that direction until it hits the edge of the map. For example lets say i move the camera towards top lane to see if i want to teleport the camera will keep on leering past the lane into the faraway edges of the map. I just got back into League, after a short hiatus. Is this something in my settings or my computer maybe? I think, (I don't distinctly remember) that i have had this problem before.