I was recently reminded of issues I've had in the past with day/night thresholds. Best example of this: on an office building, 8 cameras were mounted outside, and they practically all switched from day to night at a different point. This is not unusual, because if the sun is going down on the front side of the building, obviously it will be darker in the back. But we found that the two cameras on the back switched to night at vastly different times, even though light was about the same, and both cameras were set to the same settings for day/night switch.
Do you ever find that cameras switch too early or too late to monochrome mode?