Hello Fighters!
We have a disconnection issue in regards to new boss mode map.
We would like to give you a solution.
Please do not start playing boss mode map directly after log in game.
Instead of that, we suggest you visiting any other RF places such as waiting room, my info or store.
Then you can play boss mode map without disconnection problem.
If it does not work, please reinstall client again.
We apologize for any inconvenience.
The RF Team will try to fix this bug as soon as possible and will let you know upon finishing.
Thank you for your understanding credit to rf.ogplanet.com