I've been disconnected a few times in a row then I haven't been able to get back in for half an hour.
Nice way to start an event, you know how to convince returning player that returning is a good idea ZOS !
Yeah, it the same thing as with joining busy siege in Cyrodiil - if there is too many people, it will Dc you, and possibly again and again on re-logs.
This problem will kinda solve itself soon, as today is absolute peak population in event location, shouldn't be an issue on subsequent days.