Anyone? I was about to post this on the Microsoft forums.
I am quite annoyed by this problem since I bought the Xbox One just for this game. I bought the Xbox, a new controller, paid for online and got the game. It worked fine for a week or two, but lately I can't play for more than 3 minutes without getting the error 630 in the game, which means connection error. It seems to disconnect me from the game when there's a lot of movement on the screen. I have lowered the graphics settings which seemed to help a bit. But now it's back to disconnecting me all the time. It does it randomly too, while idle in the lobby.
I have restarted my console, unplugged and plugged it back in, logged out of my account, uninstalled and reinstalled the game. Nothing has worked.
I'm thinking it might be impossible for it to work because of the connection, which I haven't been able to get to work smoothly for years just because I live far away from other people. Maybe it will get better when I move to the south. (Same as Splatoon 2 which doesn't have its dedicated server, and when you're closer to other people it works better.) The internet service providers haven't been able to help me either. They have just said I seem to keep getting disconnected regularly and that's strange.
If it's not that, it seems to me the Xbox One is simply a pretty weak machine that can't play the game correctly
I wonder if there's anything else I could try.