Its card ban so far, playing Splatoon 2 atmSorry my friend, thats why you got banned, you injected a card 2 certificate into card 1 games and played for example mario kart 8 online. You need to read> card 1 for card 1 games, card 2 for card 2 games never go online with card 1 in card 2 or card 2 in card 1 never mix it up, its asking for a ban.