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I don’t use the link feature on my lights because they need charged too often. But, here are some shots at troubleshooting steps…
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Make sure the ones marked 2022 aren’t mixed with the previous ones.
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When you pair the old set, turn the new ones off to test this and vice versa. I am wondering if the incompatible signal from one set might be interfering with the other set.
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Pair them sitting next to each other fully charged.
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Turn all of them off, then all to on and let them set a moment (factory reset). Then all to Auto to pair.
Here is a post that described issues a user had with the new nightlights: