I fell of a few buildings because of that, and after I looted an entire ship (it took me a while), while I was at the top, looking for a way down, it teleported me off the ship like I fell from a plane, of course I was dead yet again...

This happens when you hold down the number button its assigned to it does it for EVERY item if you do it this way. If you press the button key while running he stops and changes 90% of the time.