I have an issue which started all of a sudden this afternoon. When I'm in 1st person mode and try to run my character lunges forward slightly to begin the run and then goes back to walking speed despite me holding the button down. If I switch to 3rd person mode, she runs as normal with no issues. I've tried restarting both Steam and Skyrim and going back to an old save game but neither have worked. As I play almost exclusively in 1st person mode I was really hoping that this was a known issue with a known fix. Anyone have any ideas?