I played a lot of Splatoon 2 this weekend, but when I initially tried to get onto the online lobby it gave me the Error Code 2618-0203 “A communication error has occurred. Please try again later.” I got the same error when I tried Mario Kart. I’m probably going to upgrade to a new router soon, but here are the steps to fix this communication error.
- Go to systems settings on your Switch.
- Go to Internet.
- Go to Internet Settings.
- Go to the network you’re connected on and change settings.
- Go to DNS settings, change to manual.
- Change primary DNS to 008.008.008.008
And that’s it. Haven’t had any problems since.