Establish a communication protocol at the first team meeting. Communication is the most important aspect of teamwork, in my opinion. Being fair and appropriate to everyone’s preferred method of communication while having clearly defined consequences is key to effective communication. Whenever there is an issue, you can reference the communication protocol that everyone agreed worked for them, and hold the individual accountable for their actions. That being said, people can get burnt out. Take your team out for lunch or to a team-building exercise. Allow your team the freedom to make mistakes and not feel scared to come to you about regarding it. Everyone has bad days and can get into a slump. Finding out what’s going on with the person would be a huge step in the right direction of fixing the situation.