Anyone know what's going on?

First, a juror had to leave, citing health reasons.
Second, an alternate juror who witnessed the entire trial replaced the first juror.
Third, Defense attorneys protested the new juror, apparently displeased that a jury that was likely swinging their way would now be disrupted.
Fourth, Prosecutors state that the defense attorneys complained all through jury selection process that there were not enough Blacks in the jury pool; the new juror is black. Why the protest?
Fifth, Jurors are asking the judge to explain seemingly simple concepts and repeat testimony....other jurors are frustrated and are rolling their eyes.

WTF?