tbh I have some issues finding online games of Splatoon, idk if it's the same for you ? Strangely on Splatoon i get the 118-0513 error code, but not on MK 7 or other games

i get that error or it tells me communication error occured, and now my wara wara plaza isn't working :,)

sdcafiine can reload the wara wara place if it's broken