GE links have a known firmware problem which causes them to occasionally forget who their controller is. (This flaw is why they aren’t on the official “works with SmartThings” list.)
The following may help:
GE Links are the least expensive big brand zigbee bulbs you can buy, and, for whatever reason, they seem to sometimes have trouble reconnecting to the SmartThings network after power has been cut, whether it’s from a whole house failure or just someone flipping a switch. Or even just randomly from time to time.
(SmartThings staff have confirmed in the forums that the reason the GE links are not on the official “works with SmartThings” compatibility list is that they have a firmware problem which causes them to stop responding to the Cordinator from time to time. Supposedly GE is aware of the issue and there may be a firmware update from GE in a few months, but no specific timeline and they can’t be certified as compatible yet. Meanwhile, they’re very inexpensive, but they do drop off fro…
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