Can't log in on Switch?

I get the error "Unable to connect to game server." Yet I can play on my PC without trouble. If I completely quit the game and restart the switch, I can log in. But the next time I try to play, it is again unable to connect to the server.
It takes long enough to log in on Switch such that half the time I've moved on to something else by the time the game finally logs in. If I have to restart the Switch first every time, I'll just quit on switch. I generally only use it for fishing anyway.