I have 70 zigbee devices in the project, which I know is close to the limit. Here is something odd. I have 10 shades in my family room, and I have 3 more shades upstairs in my master bathroom.
On the same day, 5 of the shades in my family room and 2 of the shades in my master bathroom went offline. They don't come back with a tug command.
There are many light switches all around these shades. And the ones in my master bath are only 10 feet from an HC800 acting as a ZAP.
So it doesn't seem like a zigbee problem to me, but something Control4 is doing?