I had this problem too. It started when I faced some sabertooths in the far north, and after that, nothing I did worked.
I even logged out and logged back in right away, and it still didn’t work.
I was playing on the official PVE server on Xbox One.
So I started playing in single player mode to pass the time. The next day, I logged back into the online server and the Stamina bar went back to normal, and it hasn’t crashed since. I played for many hours after that, without having this problem again.
I don’t know if it was a one-off on the server I was on, or if it was a specific bug triggered by some of my actions in the game.
But try playing in single player and then returning to the server (in case it hasn’t returned to normal when you return).