Happened to me alot of times due to lag during the first minutes of play on a given server. I guess the latency is causing the server to think you are running different direction than shown in your client. My suggestion is now to run too much across roofs, if necessary I'd rather crawl than die due to a bug like this.

I have a 4790k @4GHz with a GTX 780 and play on medium high settings but still get only 60 fps in the wilderness dropping drastically in cities. Everything happens when my GPU doesn't even heat up to 60 degrees Celsius. I hope for alot of optimalization ASAP.