Poor communication within a team can result in a failure to meet goals, and most certainly will result in a high level of tension and conflict.
We recommend that you agree communication channels at the first team meeting through the Team Charter (Section 4). You should also agree how information is to be distributed and where it should be stored.
Team meetings should be regarded as the best place for ensuring everyone is on the same page. If you don't have regular meetings, then this is something that you should instigate immediately. Set up a schedule and run an effective meeting.
If you're finding that there is a breakdown in communication, despite having agreed rules at the outset, you will need to raise it at a team meeting. Consider coming to the meeting with a strategy to address the issue already thought out - it may save valuable time.