I understand what and why it happened here. So I might not have been as outraged as Justice Aaron, and might have given Judge John M. Thompson (down here in San Diego) a tiny bit more slack -- or at least have toned down the language a tiny, tiny bit.
That said, she's definitely and unambiguously right. Judges can't go into the jury room -- especially without a court reporter -- and instruct and interact with the jury. Especially when they're discussing critical issues of law. And most definitely not six different times.
Even if it seems like the defense attorney (and prosecution) are cool with what you're doing, you can't do it. If you wear a robe, stay out of the jury room.
Easily understood lesson of the day. Conviction reversed.