#What does Failed to perform the action light/toggle. Failed to deliver packet: <TXStatus.MAC_CHANNEL

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hard mauve
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It happens all of the sudden on all my zigbee devices. It's been running fine for years and now, this afternoon, EVERY switch and light respond only with an error message Failed to perform the action light/toggle. Failed to deliver packet: <TXStatus.MAC_CHANNEL_ACCESS_FAILURE: 225>. I am at a total loss on this one.

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Yes, I have restarted, rebooted, ran a zigbee configuration update, attempted re-pairing of a sample of lights and switches... nothing!

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Using a conbee II stick on the usb port of a pi4.

hard mauve
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zigbee sensors are still reporting normally.