Zigbee Devices losing connection

[Massl 4]

Hello, since the update I've been having a problem where my Zigbee devices lose connection. After restarting the HC3, the devices are available and controllable for 5 minutes. After that, the connection drops again. Do you have any suggestions for resolving this issue?

[Vitruv 0]

**ZigBee devices completely unresponsive for 8+ hours — root cause confirmed: Lua scene sending hub.call() to ZigBee devices every 5 minutes via matchInterval**

Firmware: 5.210.12 | Yubii Home Pro

Posting this in case others are experiencing similar ZigBee instability — I've spent several days tracking this down and can confirm the root cause with reproducible evidence.

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**Symptoms**

- 10 ZigBee dimmers (Simpex SC-9101, ZigBee 3.0) randomly unresponsive to app commands
- turnOn / turnOff commands reach the hub immediately (confirmed via DeviceActionRanEvent in CSV export) but the physical device does not respond — no DevicePropertyUpdatedEvent follows
- Workaround: moving the brightness slider (setValue) wakes the device up, after which on/off works again
- Progressive degradation over several evenings: first delays of seconds to ~3 minutes, then complete loss of ZigBee communication for 8+ hours
- Only a full hub reboot restored ZigBee communication
- Physical device operation (rotary knob) worked perfectly throughout — devices themselves were fine

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**Root cause (confirmed by direct testing)**

A Lua scene (matchInterval trigger, every 5 minutes, 24/7) was sending hub.call() commands to two SONOFF SWV irrigation valves — which are also ZigBee devices. This continuous ZigBee traffic progressively degraded the ZigBee stack on the hub until all other ZigBee devices became unreachable.

Proof: deactivating that scene immediately resolved all ZigBee issues. All 10 dimmers have responded instantly and reliably ever since — no delays, no dropouts, tested including rapid successive commands.

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**Workaround implemented**

Replaced the matchInterval trigger (288 calls/day) with a daily Cron trigger (1 call/day at 03:30). ZigBee traffic reduced to two brief pulses per day. Problem completely gone.

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**Open questions for Fibaro / community**

1. Is there a known minimum interval for hub.call() to ZigBee devices in Lua scenes? What polling frequency is safe?
2. Is this a regression in 5.210? The scene ran on an earlier firmware without causing ZigBee instability.
3. The "Reconfigure devices" button on Settings → ZigBee (Settings → 14. ZigBee) was greyed out / inactive throughout. What is the prerequisite to activate it?
4. Is there any ZigBee diagnostic view available (LQI, signal strength, routing/mesh map) in Yubii 5.210.12? I could not find one.

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Hope this helps others. Happy to share CSV event exports or Lua code if useful.

Andrea