You are using those devices wrong, that is not how Zigbee Router devices are meant to work or be used. As started many times by many people in many threads in this forum. If it dumb to connect a smart light to a dumb switch, and that hold true if that light is a Zigbee Router device. If it is a Zigbee Router device it should always have power and should never be powered off on purpose. Zigbee Router devices work as repeaters and other devices will be connected via them so unplanned powering off them will cause problems for those other devices. The reason the Philips Hue Bridge works better in those scenarios is that they implemented workarounds to hide the users bad behaviour instead of informing users how Zigbee Router devices are meant to work. If you want to have lightbulbs connected to a dumb switch then you should buy those from Sengled or similar that are Zigbee End Devices instead. Read and follow the tips: