Players are receiving temporary bans but Nintendo's on it.
Peach players have discovered a glitch in the online "For Glory" mode in the Japanese Super Smash Bros. 3DS that has resulted in temporary bans being issued.
The princess's Down-B attack is suspected to be the source, causing the game's online mode to register cheating if it's used near the start of the match. Since "For Glory" mode specifically restricts item usage, following a tournament style set up, players theorize that the game's anti-hack security registers this as bringing an item into the match, therefore issuing the ban for cheating. It hasn't been confirmed that this is true, but so far other characters with similar attacks (i.e. Link's bomb attack) appear not to be likewise affected.
Smash's new temporary bans are designed not only to prevent cheating in tournament-style matches--hacks or otherwise--but also for protect matches from falling victim to poor player behavior and consistent connection problems. Hopefully once the bugs have been worked out, this system will help online play run a bit more smoothly.
Nintendo has already been made aware of the issue and have declared that they are already working on an update to fix the glitch, which they anticipate to have available by next week.
