It only started to occur within the past 1 1/2 to 2 weeks, soon after the last small patch I believe (either for steam or for Skyrim itself I can't recall). One day the game was running fine and the next it's messed up. What happens is that if I am pushing the "w" key to move forward, every few seconds my character is suddenly and without warning halted. I can still move sideways, backup, look around, draw/sheathe my weapons and cast spells, but if I want to move forward again I must depress and then repress the "w" key. At first I thought it was my keyboard, since it was old and that particular key was starting to get stuck, but after plugging in a new keyboard the problem persisted. I tried loading older saved games to see if it was the result of crossing into some zone that caused a bug (and my main save file is 10mb, may be a problem there?) but nope, same problem; even after starting an entirely new game the bug was present right from the start. I then thought that perhaps this was the result of installing several mods a few days before (better water, textures, foliage, night sky, craftables) but after uninstalling them, again the problem appeared. Yesterday gave up and completely uninstalled both Skyrim and Steam, and removed all saved games and other extraneous files related to both programs. I then completely reinstalled both Steam and Skyrim, was forced to update them before being permitted to launch the game, and what a surprise......the halting/stuttering movement bug reared it's ugly head once again. To be clear, by stuttering I do not mean a fps/lag issue, the game runs perfectly smooth, but it's as if my character's feet are rooted to the ground and I am prevented from moving forward until I depress and then repress the "w" key.
If anyone else has encountered this issue please let me know. I have attempted to contact Bethesda about this and other problems in the past but as usual I either receive no response at all, or am sent a typical automated message worth absolutely nothing.
Thanks