Treyarch have released a new game update (18.104.22.168) for Xbox One and Playstation 4.
22.214.171.124 update fixes some known Zombies bugs:
- Fixes issue where players were kicked whilst playing 4 player split screen
- Fixes issue where Keepers would get stuck
- Collision fixes
126.96.36.199 – Zombies! Fixing up 4-player Split Screen players being kicked. Collision fixes. And a bug where Keepers would get stuck.
— David Vonderhaar (@DavidVonderhaar) January 27, 2016