What would cause a switch to do this? (Random rapid changes in dim level)

It scared the crap out of me at 03:40, but as soon as I turned the switch off, it stopped.

Any ideas?

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From time to time (though pretty rarely), all my Z-Wave lights … well… all those within sight of the living room, start flickering rapidly - even though they are on different outlets.

Small home, so they may be on different electrical circuits.

I’ve never bothered to check the SmartThings log to see if these were actually recorded events. I figured either a general surge-type issue, or a Z-Wave network glitch.

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Then I won’t worry about it! That was the first time I’d seen it happen.