The link below is to federal 6th Circuit decision reversing the trial court which failed to itself or permit counsel to inquire of jurors as to a color claim of misconduct affecting the verdict. Here it was a juror's extraneous communications with a prosecutor (who was not involved in the case).This is but one of several cases in the past few years cautioning trial judges not to ignore claims of alleged juror misconduct but to inquire further through counsel. (a Remmer hearing) There should not be a race to finality but rather a thoughtful systematic inquiry into what happened and how it may have affected the verdict.
http://www.opn.ca6.uscourts.gov/opinions.pdf/17a0208p-06.pdf
http://www.opn.ca6.uscourts.gov/opinions.pdf/17a0208p-06.pdf