Wifi decided to take a vacation without telling me

[Jinxi the Linoone]

So my wifi's acting up. I can connect to wifi just fine. Test connection: works great.
I can get into the wifi plaza, but that's where my problems start. Say someone's seeing trade participants. I apply, waiting... waiting... waiting... I get disconnected from wifi, and kicked out of the room.
Say I'M the one seeking trade participants. Someone applies. Waiting... waiting... waiting... they failed to respond, and get kicked out of the room.
Obviously, mt DS is the one with the problem, as this has happened with more than one person.
The kicker, I've never had a problem before. I was online trading with one of my friends in this way just yesterday. This morning, it's not working. Any hints?

 

[Badal]

Yes this has been happening to me too!
Though it is mostly either because of firewall settings or lag
look it up on support.nintendo.com
Look at the Error code and input it there.

 

[NismoZ58]

Well, if your error code happens to be 61020, it's likely firewall settings. The exact same thing happened to me one time.