I have a working theory of what this issue is, as well as mitigations for it.
What causes the tradfri bulbs to crash appears to be receiving a new command while the light is changing.
This creates an issue with Hue groups. Say you have 3 bulbs grouped together in a fixture, and that fixture is then grouped to a room. And you have all your hue lights connected to a voice assistant like Alexa.
Alexa treats groups and individual lights as separate devices. So if you ask alexa to turn off all the lights, it will send the command to the room group, the lamp group, and the individual bulb. Resulting in 3 commands hitting the bulbs at once. The bulbs then become unresponsive until power cycled.
I mostly solved the issue for myself by ungrouping the lights from the fixture, and changing the alexa defined room group to just have the bulbs and not the hue room group.
This drastically reduced incidences of the issue, as long as I am controlling the lights through the alexa room OR the hue room.
It’s super annoying, and I wish I had a way to update their firmware to see if it fixes the issue, but I don’t have an ikea hub.
