I’ve come across a couple old posts about this behavior but still haven’t found a solution. I have 6 Sengled BR30 bulbs tied to the same light switch and only connected to my SmartThings HUB. I also have them in a Group/Room in the SmartThings app. I have no automation/routines set up. At random times throughout the day/night all bulbs turn on at once. When this happens and I visit the app the “status” is different each time. These are the various statuses I see.
a. The app says all lights and the group are connected but all OFF.
b. The app says the group is OFF but one of the 6 bulbs is ON (it’s not the same bulb each time I see this).
c. The app says the group is ON and one of the 6 bulbs is ON (it’s not the same bulb each time I see this).
d. The History doesn’t show any ON event at the time all bulbs turned ON.
e. The History shows one ON event for one of the bulbs at the time they all turned ON.
Note that in every scenario all of the 6 lights are physically turning on all at once (i.e. it’s never like 1 bulb or some subset of the 6). So as you can see this is very confusing. I have already run through all the reset exercises, deleting and re-adding of bulbs and the group, uninstalled/reinstalled the app, cleared cache, etc. – Basically I’ve tried everything support has suggested.
One post mentioned disabling the auto update service within the app. I just did that now under SmartThings settings > Auto update device and services > switched that to OFF. I also went to the Hub settings and set Device firmware updates = Do not allow. I am now waiting to see if that resolves the issue. I also see there is a Secure mode setting. I’m apprehensive to turn that OFF since it says if the bulbs loose connection I have to manually re-add them. I’d rather not turn that off b/c the bulbs are in a ceiling fixture/not easy to get to without a ladder.
Phone: Pixel 4 w/ Android 10
SmartThings App: Android version 1.7.47-22
Hub: SmartThings (3rd gen/latest) w/ firmware version 000.031.00004
Hub is hardwired to my router and according to support the WiFi connection/communication distance to the bulbs is fine and strong.
Bulbs: Sengled BR30