Hello,
I just checked your server and it seems to be operating fine. Unfortunately, this means that you most likely have a poor connection to the game server (not the same as a poor internet connection). Please try these steps to see if the issue can be resolved (please make sure to do all steps and do not skip any):

1) Clear the Client Cache

You can clear the cache of the mini-client by clicking the cog icon in the top right of the game screen and then choosing 'clean up system'

2) Flush your DNS Cache

To flush the DNS cache, you will need to click on the 'Start' *on, then 'Run' and type 'cmd' and hit enter.

When the Command Prompt screen appears, type 'ipconfig /flushdns' and hit enter.

3) Reboot the PC (To be extra sure, reboot the Modem/Router too)

If doing that doesn't fix it, you may need to try VPN programs (and all of the servers the programs have available to you) or contacting your ISP for assistance.

In extreme cases, if a VPN does not work it often means that the outage is too close to you to be routed around, meaning you will have to wait until it is fixed. :( I would again recommend contacting your ISP in this scenario.

I don't get that black screen during login. It happens during battles and everyone on my server gets it at one point.

Which version of the client are you using? 2.3 and 2.4 are much more prone to black screens (you'll get them no matter what, the longer you play). The 3.4 build is much more stable and should not see this issue regularly unless, as mentioned, you have a poor game connection.