I've been experiencing this for about a week now. It sometimes brings me to a complete stop after cancelling the sprint. It absolutely makes the game almost unplayable. In my case it almost seems like it could be some type of latency issue. Because if I go somewhere like the Enclave on Mars, where there's not much terrain or anything to render, it doesn't happen. [UPDATE] Upon further investigation, I found that if I was facing the edge of the map (where I wouldn't be graphically rendering much, it wouldn't happen. But if I faced inward and looked toward a lot of terrain and stuff that would need rendered, it would happen constantly. So I tried turning down my graphics quality slightly and it now happens much less frequently. I hope this helps someone if they encounter this.