I had a similar issue last night, that didn\'t seem to be caused by lag.
I ran out of Hydlaa towards Ojaveda. I notices that my stamina bar was not dropping, although it had been functioning earlier. I got just past the end of the forest (near the mushroom), when I stopped moving. I looked at my endurance, and it was at 0%. I had been running the entire time. Normally I can not run once I hit 20%, but this time I ran all the way to 0%, and then my stamina did not increase.
This didn\'t seem to be a lag issue, because I was not \"frozen\". I was able to turn, I could cast spells, and basically do anything that didn\'t involve moving. I tried /unstick to see if that would \"reset\" me, but it did nothing but teleport me a few feet. I waited for a full five minutes before /unsticking myself to the DR. Unfortunately, I crashed at that point, so I don\'t know if the trip to the DR would have fixed me. When I logged back in, I was in the DR and everything was back at 100%.