In response to the many posts in the thread asking 'where are the moderators?' - I don't work for EA or Envision and don't inhabit these forums 24/7 either. I play regularly on the PTE and occasionally on other worlds.
Most importantly, for me, I also don't spend 24/7 on the computer. Messages to me here get seen eventually.
Tib 51 does seem to be a particular problem and I'm told that it is being investigated by the developers. As has already been pointed out, the servers the worlds run on are monitored automatically and should certain types of failure occur then action is taken. Unfortunately due to the nature of the virtual server setup (common in the gaming industry) individual worlds in difficulty may not be identified as quickly as players wish.
It seems it is working now.