This is a very strange problem I've encountered more than once. What happens is that my stamina randomly drains even though I am not moving at all. The first time I figured it was from encumberment and it was cured after I reduced some of my burden. This second time, nothing I do gets rid of it, even stripping down to no equipment and removing everything from inventory. When I drink a stamina potion, all of it withers away and stays at zero. WHAT THE HELL!!! Anyone have any ideas?