Are you using the S40s? I tried to use the s40 lite but had lots of issues. I added 4 and they would work for a while, indicator light would go into fast flashing state and then they would stop responding. Physically turning them on they would start working again. They also caused some of my other zigbee devices to stop working. Tried changing zigbee channels with no change. I took them out and added in some Sengled and Third Reality with no issues at all.
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