Talk to the team member directly. Explain clearly the issues his behaviour is causing and that this is not acceptable. Over the next few days, where he has performed well, take time to praise the improvement and build his confidence in the success of the whole group.

Decide that the member needs to develop their group communication skills. Suggest they might benefit from some training on team interaction and offer to share with them how you would handle difficult situations without causing conflict.

Arrange to have a discussion with the whole group, in order to get all the issues surfaced. Ensure each member has their say so that you can help them reach agreement on the best way forward.