I am getting sporadic Error 630's as well...
I'll go through phases where I won't disconnect for an hour... then I'll just start to disconnect constantly.
Consistent error triggers:
Moving from Lobby to PQ/AQ and back Moving to another channel 50/50 chance to Error when Moving from Arks Lobby to Ship/Quest on another channel (this is asinine when it comes to joining Buster Quests).
I'll note that I highly doubt this is related to ISP. My home ISP is Verizon FiOS. I'm visiting my relatives and they have Comcast xFinity. I am on a wired Ethernet connection. I don't have connection issues in any other games.