Maintenance for the week of April 20:
• NA megaservers for patch maintenance – April 20, 3:00AM EDT (7:00 UTC) - 12:00PM EDT (16:00 UTC)
• EU megaservers for patch maintenance – April 20, 7:00 UTC (3:00AM EDT) - 17:00 UTC (12:00PM EDT)
Its your internet connection most likely. Reboot all your modems and routers and what not and try again. If that doesnt help then contact ZOS for help because something is wonky and they need to fix it.