I've noticed since the update that when playing in someone else's game stamina will stop regenerating and dip back down without performing any actions. This makes combat, and honestly the game in general (for me at least), impossible to enjoy. This is particularly noticeable when using the Mint Mace. It also results in intermittently being unable to swing your weapon, for whatever reason. I can replicate this issue in any game that I am not hosting. Stamina regeneration works as intended for the host. Has anyone else noticed this? Is there a fix? I cannot enjoy playing someone else's game right now, and we've spent 100+ hours on a game started on our XSX. So far, this update hasn't been much of an update.

I have noticed terrible stamina drops as well.   I play single player Xbox.