Maintenance for the week of May 19:
• PC/Mac: No maintenance – May 19
• NA megaservers for maintenance – May 21, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
• EU megaservers for maintenance – May 21, 8:00 UTC (4:00AM EDT) - 16:00 UTC (12:00PM EDT)
• ESO Store and Account System for maintenance – May 21, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC) https://forums.elderscrollsonline.com/en/discussion/677862
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.