Hire quality, competent people and not just bodies to accommodate or fill shifts. Be consistent with progressive discipline for problematic and toxic employees (especially the ones who have gotten too comfortable and have been employed there for a while) and ensure that your infrastructure is current and up-to-date. Micro management can kill the overall workplace environment and morale. Not enough supervision in other areas of the department. Reevaluate or oust your incompetent supervisors and managers.