Screen resolution is at the lowest setting. Seemed to help a little but not much - or that may have been coincidence. I've tried lowering various setting (shadows, anti-aliasing, etc). It may not be related by my sprint function (ALT) has gotten a little sticky-glitchy today, too. Often just after fast travelling, but can also happen while I'm running/sprinting through town. Suddenly, today, I'm getting very frequent crashes to desktop - usually when I'm in major cities. I've been playing Skyrim for a few months without issue - character is level 38.