Crash After BG MOP 5.4.8

In Mists of Pandaria 5.4.8 just today (never had this issue before) me and my brother crash after we get out of a battle ground. Then when we try and log on. we crash just as our characters finish loading. says WoW Error. So why is this happening I've never had it happen before.

Try deleting Cache. Does the issue happen with other characters as well?

A lot of ppl got the problem atm on MoP realm.

Problems with the server