Can't fight boss

I've missed out on 2 bosses already cause of this. It says boss info loading but it doesn't load no matter how long I wait, I had a vertedeath that was 1 attack away from death that I lost and now I have another monster that I can't even start fighting because of this.

[support10]

Dear player,
Last sunday,there indeed was the issue of boss vanishment.We have repaired the problem already.This brought you such a inconvenience，we feel very sorry.You might check,if you encounter same problem again, please feel free to contact us.
Teresa

Dear player,
Last sunday,there indeed was the issue of boss vanishment.We have repaired the problem already.This brought you such a inconvenience，we feel very sorry.You might check,if you encounter same problem again, please feel free to contact us.
Teresa

Ok thanks. Haven't had a problem since so I'm set