Can't join game server[Deathwing] after disconnect

Hello,
So the story is:
Me and two guys from same subnet join game, doing dungeons or battlegrounds, ping 30 - 150, connection is good, no packet loss within hour(from multiple sources, including www.warmane.com). Then we all get disconnected. We connect to login server, however we can't connect to Deathwing game server for 5-10minutes, it "connects" for a while and throws us back to login server(we CAN join any other game server instantly tough).

I asked some guys from guild and group who were online during this, they said - no disconnect for them, everything was fine.

I really have no clue anymore what could cause this. It has been almost month, can't play, can't enjoy game.
Please help, maybe someone has similar problem or have any advice?

I have the same problem I get "Unable to connect" window after trying to log on, my internet connection is fine, server is up but I can't connect. I swiched firewall off and flushed DNS, still can't log on. I tried asking for help via the ticket system but to no avail...
I was able to connect like once every two days,though... and then DC randomly.

Please help!
Why I can't connect to Deathwing game server after random disconnect occurs? its like server is down, but everyone is playing, except me of coarse... why?