A week or so ago, I started getting a CAS error while trying to log in to World of Warcraft. I could enter the game by repairing it from the game menu, but the issue kept recurring. Later, when repair stopped working, I uninstalled the game and reinstalled it. However, the problem persisted.Than I tried to uninstall and reinstall Battle.net application it worked. I can enter WoW but at start it start with disconnect to game and i need to use reconnect than enter the game. So after 2 days the problem of WoW update stuck issue began again. Stuck at start with conneciton error message. When I tried to reinstall the Battle.net application, it gave me the BLZBNTBTS00000028 error at 25% completion. I’ve tried various troubleshooting steps, but haven’t found a solution.