1. Were you in fullscreen? Yes
2. Were the controls set to default? Yed
3. Which browser/OS was it? Any special language settings? Google chrome, Danish.
4. Were you near a downed enemy (with prompt for nonlethal takedown)? No particular place, it also seemed to do it in the shop and in generel anywhere i went.
5. Did you have an offhand equipped or click left or right mouse button when it happened? I were only rotating my mouse at any given moment. So its possible that i just dont understand the mechanics well enough, but as i understand you are suppose to rotate the mouse, to create momentum but it feels (to me) that i just get stuck on sometimes.
Here is a video, skip to 15 seconds in, after that point i cannot swing it for several seconds.