Lights Randomly Turn On

Because this is zigbee, when you power cycle, leave the hub off of power for about 20 minutes (including removing any batteries). That will force a resynch.

Ok, got it. I’ll leave the hub disconnected, with batteries removed for the next half hour. I’ll report back my observation later in the week, and will let you know if the issue persists. Thanks!

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Interesting, my issue is with a zigbee device. I will try power cycling my hub tonight. I tried removing and readding the device last night but this did not fix the issue.

Just reporting back on this: I tried to power-cycle the hub, including removing the batteries, and let it sit for 30 minutes before plugging them all back, and that did not help at all. This morning one of my lights, came on automatically, so the issue still persists.

BTW, I also wanted to mention that the bulbs that’re turning on are random bulbs, and not the same one everytime, and another thing I’d like to mention is that I had an electrician friend of mine do a random check on fluctuations, and he said that he couldn’t find anything abnormal, so just to make sure since some folks have been indicating that electrical could be another problem, but apparently not.

Some additional observation since my last update:

  1. Some of my bulbs are randomly getting stuck in ON mode, and trying to switch them OFF does not work, either from ST app, or even Alexa.

  2. One of my multi-purpose sensors’ status was rapid going between open/close modes while I was watching it on the ST app, and then I had to manually open/close the door to stop that.

These last couple weeks has definitely been the worst experience with my system, and hope somebody from ST can tell us what the heck is going on? Please? :sob:

If these are zigbee devices, they know what’s going on, which is that the last firmware update to the hub broke some stuff for some people. There’s no fix yet, but support is aware of it.

It’s being tracked in the following thread:

Thanks @JDRoberts, if that’s the case then I guess it warrants an incident that should be reported at, and will also reduce noise on the forums, and more folks that’ll be impacted with this can track the resolution by subscribing to the incident.

IMHO, to me this is an outage, because my system does not seem to be working as it should, caused by the wrong states reported by the things in the network.

This issue was first logged a year ago. While during the course of the year many folks have reported having the same issue, there looks to be no resolve or reply from support of any kind. Is that correct? Or are folks being contacted from support and not posting how things were resolved?

It’s a symptom which has been caused by multiple issues over that time. Some have been resolved, some of the more recent ones, like the recent zigbee firmware update mentioned a couple of posts up, are still open.


I’ve experienced the exact same issue. I purchased the SmartThings with the home lighting package that comes with 2 OSRAM Lightify LEDs. One of the lights is in my daughters bedroom and has turned on at random points in the day without any effort on our end. I’ve notified ST, but no resolution as of yet. Could this be a security issue? Is it possible someone is controlling my light? I may just disconnect until we can resolve this.

The light bulbs will default to On in the event of a power outage or flicker. A couple of our staff have witnessed this occur with voltage fluctuations (ie. the circuit is never broken/power doesn’t flicker) - it’s hard to pin down, but might be due to an old (or poor) wiring connection somewhere… or the blow dryer/flat iron/washing machine/TV causing a spike/dip in the draw.

Is there anyway to modify this to not default to On in case of a disconnect? Seems many users have seeing problems.

Also, add another VERY frustrated user to list. 2 of the past 3 very early mornings my bedside light (SYLVANIA LIGHTIFY) has turned itself on, last night was at 1:19 AM and the previous was at 3:45 AM or so, not cool.

I have attached a screenshot of my logs from this morning (removed the pings for readability). My hub is powered on a dedicated circuit (detached garage with it’s own internet source) so there really no reason why the hub is disconnecting on it’s own. I also thought it had a battery backup to help with power loss.

I just installed my home monitoring kit and am strongly considering returning and looking for a different device because this is crazy.

Hue lights randomly coming on

This just happened to me last night. Full story:

Yesterday during the day, I noticed that one of my dimmers (dimmer A) showed up in the smartthings app as inactive. That’s never happened before. I physically toggled the switch on then off, and it seemed better.

However, last night at about 3am, dimmer A turned on to 99% brightness all by itself. Freaked my wife out – she happened to be up at the time. I looked at the events on dimmer A, and it didn’t show any app-initiated events. Just looked like the switch turned itself on (though I don’t really buy that). And prior events show it’s been going offline/online occasionally for the last few days. I opened my smartthings app, and noticed that 2 other dimmers (different ones) were now offline. I power-cycled my smartthings hub, and that seemed to resolve itself. I then looked at the events for all 4 dimmers in my house. 3 of them have been going offline/online on occasion for a couple days, the other has been perfect. They are all GE dimmers.


  1. Power issues. This is my least favorite theory, because that would imply that my smart lights are unreliable and will do unacceptable things and I have to get rid of them (which would be really sad). I also hope this is an unlikely theory, because the correlation of multiple dimmers (dimmers only, not any of my normal switches) having intermittent hub connection issues, then this incident occurring, is pretty suspicious.
  2. My hub was having some issue that resolved itself on reboot. Note that I haven’t seen any devices go offline since, but it’s only been about 7 hours.
  3. smartthings pushed some new version of the hub firmware that had bugs.
  4. Other?

I want to think it’s some transient issue due to a bug that will be or is fixed. I’m not sure I can tolerate lights randomly turning on in the middle of the night. Will probably open up a support ticket, though not sure what to expect from that.

One more data point here: I have a GE Link bulb or two that randomly turn themselves on. They have a few Smart Lighting automations attached to them, but the device logs don’t show an automation triggering the bulb to turn on. Most recent example: floodlight turned itself on in the middle of the day while I was away for the weekend. This bulb is in the same fixture as an identical bulb, which did not turn itself on, nor did any other smart bulbs in the house, so I don’t suspect a power issue.


I have a dimmer light and it started doing this last year. Then suddenly stopped. Now started again. I noticed it happened when the weather was hot and stopped in September. I am frustrated because the lights are $6 each and have to keep replacing them. Let us know if you find a fix.

One of my GE dimmers has turned on by itself now twice. The first time it didn’t for to full brightness but at 46%. It was freaky as we have a motion sensor near it (doesn’t control the light) and it showed no motion, so nobody touched it. I couldn’t figure out how it happened and eventually shrugged it off. Now about a month or so later it happened again, today. Same switch, but on at 100%. Nobody touched it. Guess I will call support in the morning and see what they say, but it does concern me. We have 4 of the same switches and one one (that we have noticed) has done this. It was on for over 7 hours today. Came on at 2:06 pm.

Well…called support and there was nothing he could see that was strange. Guess if it happens again, I will have to replace the switch and see if that fixes it.

This has been happening to me over the past few weeks. Judging by how far back this thread is going, SmartThings just ins’t taking this problem seriously. I’m a few more events away from disconnecting the hub and going with Iris. I have a GE dimmer switch connected to a dumb light and a set of Philips Hue bulbs in my study and another one in the same room as the dumb light. ALL OF THEM have been turning on without at odd hours of the day and night, totally freaking out my wife. Considering how this has been happening since 2015, and SmartThings folks haven’t fixed this yet, people need to stay away from this device. If it can’t control lights properly, how is it going to control other more critical items like locks, doors, and valve servos for water?

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Add me to the list.
Only happens on a hue lightstrip, all other devices (mainly fibaro dimmers) behave themselves.
Guess I’ll try a core piston to turn it off again. Seems bonkers that the issue rumbles on.