I found this to be occurring as well since last patch.
Have your camera not focused on you - can move screen freely
Click and hold on minimap - the screen goes to wherever you click on minimap
(new since patch)
As soon as you let go of the mouse, the camera auto locks on your character. Instead it should remain where your screen was when you let go of mouse.
It should do this if you presently had your camera locked on your character at the time of clicking on minimap, but if you dont have the camera locked on you then it shouldnt auto lock onto you after clicking minimap.