Camera Speed

After nearly 1000h i still found a pretty basic question. im navigating the cam with wasd while playing but suddenly the cam speed decreased. Holding the hotkey "shift" the speed is increasing to the usual speed again. Without holding the cam is moving really slow now. How can i switch to old mode im used to play with. I mean playing the normal speed just without holding the shift key?
 
I find sometimes the game seems to change camera modes, even when I'm super certain I didn't do anything to cause it: if you press T it should go into the alternative (very slow moving, to imitate walking around) mode, then if you press T again it should go back into normal mode, and start acting normally, that works for me at least!
 
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