I've also been getting this issue. I think it's something to do with your character not being able to load but I haven't looked at the crash logs so don't take that as fact.
This 'bug' was way more prominent on my second save, it would happen almost every time I sprinted.
On my first save, however, this crash didn't happen in my first 2-3 hours of gameplay.
Another one of those stubborn bugs.