Any known bugs causing user to logout without any script or inactivity trigger?

I have a weird condition where my session.props.auth.user.userName is going back to Null after a time period, but as far as I can tell I have no scripts or actions telling system to “Logout” and the inactivity timer is disabled or set to a long time period which should not be causing it to logout when it does.

It’s possible there is something in the application that I can’t find which is triggering this, but I’ve looked in all the places I expected and can’t find anything so I am wondering if its possible there is a bug that causes this that anyone knows about. Has anyone else seen something like this?