What error? I used to get errors all the time
Now I use my phone hotspot when I need to go to another town/have someone come over and haven't had any issues
Yeah, I'm pretty sure that's a problem with some routers that just don't play nice with others
There are a bunch of fixes in nintendo's support that I never had any luck with
The easiest solution is to use your phone hotspot if you can, otherwise I'm sorry that I can't help you out