Zigbee battery bulbs show 'unavailable' intermittently after switching Wi‑Fi router to a 2.4 GHz channel overlapping Zigbee spectrum
## Environment Home network: Wi‑Fi router set to 2.4 GHz channel 11 (2412–2462 MHz band edge), Zigbee coordinator (ConBee II) and ~20 Zigbee devices (Philips Hue and battery bulbs) on Zigbee channel 15; devices run on separate USB stick coordinator ...