Hello Thomas,
- Which Homey model?
- Are the wifi and zigbee channels tuned? https://support.metageek.com/hc/en-us/articles/203845040-ZigBee-and-WiFi-Coexistence
- Pls show a screenshot of your zigbee mesh https://tools.developer.homey.app/tools/zigbee
- Can you recall what changed since the issue? Firmware or app updates f.i., neighbors have new wifi system, power cut, …
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