I dont mean to jump on the bandwagon with this one, But im having similar issues with zigbee devices. I have 4 zigbee repeaters and 8 motion sensors, 4 contact sensors. I did have 1 ikea zigbee bulb directly connected and 4 wemo bulbs. I removed the ikea bulb and got lots better performance. But this morning woke up and 4 of the motion sensors are sensing (green motion light triggers) but they arent firing the motion lighting rules to turn the lights on. They arent reporting motion to HE but they are showing as bouncing off the repeaters on the table.
Last night I walked around and every sensor was working and reporting, but wake up this morning and - issues.
Iris V2 motion sensors
ST contact sensors 2018
I need to remove the wemos from direct connection, but from the table none of my sensors are repeating off that.
