I would guess it's your DNS cache
ipconfig /flushdns
inside an administrator command prompt might fix it.
Or
sudo dscacheutil -flushcache
inside a terminal window if you're on a Mac.
im not really into stims usually, but that along with the pressing need to go potty but inability to is causing great consternation for me this morning.
I'd be down to play any of the MP Switch games that are out if anyone's interested...my switch is in the other room though so I can't post my ID code at the moment