I was playing the combined arms objective. I had moved to the first point, and proceeding to the second. At this point I was holding W/movement keys to move around. I pressed shift to walk, and all my controls completely locked up. I was unable to move, use gear/map interface, and could not access in game menus, nor use "cheat" codes like flush after using the correct key sequence.
I had to end the game process from task manager as I was unable to close down normally.
The only other time I have been able to produce a similar issue is when being killed while typing into a place map marker. Inputs become locked and you can't close the game normally.