SSC Elevator Boss

The second I step on the elevator in SSC, the game logs me out. Help?

Does this persist after having attempted a client repair?

/https://support.blizzard.com/en/help/article/6572

If so, you might be looking at a UI reset to test whether the issue is caused or exacerbated by one or more installed AddOns.

/https://support.blizzard.com/en/help/article/7549