Yeah I am glad more people are starting to recognize this. I've gotten told by more and more people that they're seeing this.
Where it tends to be the most noticeable is group fights. Get focused in a group fight when you have slightly low stam and watch that yellow bar vanish and get swatted away out of your control. It's a very frustrating feeling. When I first saw this happen I assumed it was an intentional change by starvault to make a certain type of gameplay stronger- namely, "zerg" style where you get focused by several people and are absolutely powerless to stop yourself from becoming a lootbag. If I have the skill to parry 4 dudes who are trying to focus me, I should get to live. It's not like that right now. Some people never equip enough gear to see this, I'm sure if you run around naked with an emalj sword all day you don't have any concerns for stamina because you die if you get hit at all anyways. But if you actually play the game as intended, gear up and do some group fights with your crew. Let 4 guys focus you when you're low hp/stam and watch how you mechanically can do nothing at all. Your little yellow bar will vanish which means you can do nothing but watch your screen turn red and then gray.
Henrik said they're investigating possible stamina bugs. I can't say what's happening exactly, but I can say it feels the worst when you're in a groupfight and you get focused. It feels like you can't even parry when you should be able to. Also I have noticed something that feels like a bug, but perhaps it's a mechanic I'm not aware of at play - sometimes when my stamina is low, say 15-20%ish, I can't parry, or my parry seems to come up delayed somehow. Since the circumstances are a little difficult to replicate, I am not sure what's happening there, but it doesn't help anything, and it feels so frustrating when I should be parrying but my character is standing there getting flopped for no discernible reason.