Log in, enter the game world, play for a few minutes... game world becomes unresponsive (latency does not change, connection is not dropped, I just can't interact with anything in the game world)... quit the game (can't log out, not enough "connection" even for that), attempt to log back in, encounter an "Error 200", drop and re-establish my VPN connection...
Rinse/repeat ad infinitum. Also experiencing short login queue issues (a few seconds, generally) on login, so I assume much of the community is having these problems at the moment.
It is possible there something going on in general with the internet, general infrastructure/topology, but none of my other services seem to be affected. I would assume something is happening at the ESO server end.
I have not yet tried without VPN, that will be on my list if the problem doesn't heal itself.