Hi Hannes, seems like zigbee mesh and or zigbee/wifi related.
Do you have enough router devices? What’s the distance to the nearest one?
Athom zigbee advice
If you run firmware v5 or higher: did you perform a zigbee reset after update to v5?
(Be warned, all zigbee devices have to be re-paired, and flows need to be fixed)
Zigbee network and channelnr info:
https://tools.developer.homey.app/tools/zigbee
Zigbee & WiFi frequencies interference.
Interference check:
http://ostgardh.se/wifi_zigbee/index.html
Background:
Wifi advice:
http://wifimetrix.com/channels-1-6-11-only
