Error code 395002, seconds away from finally killign the world boss

Just seconds before we got the world boss down, with 2 minutes left, we get error code 395002 and cant log back in before after the boss timer is done.

I was on every single boss fight so far and finally we would get him, but no.
There is no guarantee i will manage to do that tomorrow.
World boss times will always have more players online, so please keep that in mind to avoid your servers crashing, if possible