Judge Controls all Trial Proceedings

At a trial of a personal injury case, which can be an accident case, medical malpractice case, or even a wrongful death case, the judge will be in charge of supervising and controlling the courtroom. In every instance, the judge will instruct the jury not to discuss the case amongst themselves during any of the breaks. The judge will make it clear to the jurors that they are not to talk about the

case during the breaks and when they leave for the day. Why does the judge give this instruction to the jury?

Why Jurors cannot Discuss the Case during Breaks?