A disciplinary or non-disciplinary breach

For several months Chantal has been regularly arriving late. The supervisor asks you for help and tells you this: my team can no longer bear this situation, his delays at work lead to negative repercussions of the service, a disorganization of the team and an overload of work for his colleagues. In your opinion, is this a disciplinary or non-disciplinary breach? What approach would you recommend to resolve the situation? Justify your answer