When I get in the Wifi room, I sometimes get the error code 86420. It doesn't happen with every person I trade with, but when it happens once, it seems to not stop happening to that person. It seems like it's a problem with my Wifi, but the problem is, I use Public wifi (Library), so I can't tamper with the router or find their settings out..
Now, it doesn't happen with every person I trade with, only some people. I successfully traded yesterday, and a few days before that. But with some people, this happens.