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I've seen three occurrences of something strange on my system: most (but not all) of the lights in the house were turned on in the middle of the night. It did not happen at fixed times, and only a few times so far; not every night. The controller we use for scene logic (OpenLuup) shows no scenes ran at that time of night (plus we have no scenes that turn on everything). Strangely the Z-way log shows no "on" commands being sent to the lights, though we can see the "off" commands when we turned everything off again.

What could be causing this? I've had a few lights react weirdly (blink a few times) to alarms being issued on the ZWave network, but nothing like this. I didn't spot a notice of an alarm in the Z-Way log either but I might have missed it, there's a lot going on on the network.

It happens sometimes with some devices on mains power spikes - the device reacts on this by turning on the light. If no report was delivered to Z-Way, then it is a clear device frustration. If there were - it might be spuriuous voltage on S1/S2 pins (if it has such).

But that was just an assumption

Sounds plausible if it was just one light, but when it happens, almmost all lights are turned on at once. Maybe some sneaky thing is sending the all on command... though I never had it happen until recently

I had something similar a while back.
One device was sending invalid commands.
After a few times over about 6 months, Searched the logs for 'error' that pointed me towards 'switchall'
Somehow even though I had removed all my lights from the SwitchAll group some managed to still be included.

https://forum.z-wave.me/viewtopic.php?f ... all#p82205

Thanks, I might try power cycling everything. My log shows no switchall command though, and no errors around the time everything switched on.