Since last post from Jerry didn't show properly about this bug (cuz my screenshot skills sucks q-q) i made a short cellphone video.
Btw in video my char WolfAlone have a charm of serenity which i think it's not working properly either.
It happens randomly, char just lose all speed looks like he's on walking mode without speed buffs (but running q-q).
Happens more often when you let char running automatically