Reasons teams get locked in Yahoo Fantasy
In an effort to keep the gameplay fair and enjoyable for everyone, teams can get locked based on their behavior. Locked teams have certain privileges revoked -- such as adding or dropping players, editing their roster, and posting to message boards.
Private League commissioners have the authority to lock any team (at any time) without warning. If you've been locked, try to contact your commish on the messages boards or by email (if those options are still available). We won't interfere in Private Leagues for any reason in anyway. There's no exception to this policy and encourage you to pick your private leagues carefully.
A manager in a Public or Pro League found to have violated the Terms of Service or Fair Play & Sportsmanship guidelines, among other codes of conduct, may be disqualified from the contest. In addition, Pro League managers could be ineligible to win a prize, as per the individual fantasy sport's official rules: