zlacker

You might actually need two hubs, which is why the sync box doesn’t work very well. I don’t have the sync box but I noticed the hub struggling with automations on about 60 something lights.

I now have two hue hubs, and a zigbee 3.0 controller with over 120 devices.

Easily run 8m of the best (high density, super bright which is actually too bright) RGB CCT rope light from a single zigbee controller. Perhaps its the controller and power supply you are using?