Update from Athom Support:
We have analyzed the problem over the past couple of months and it seems like this issue is being caused by a “bug” in the Zigbee part of Homey (the protocol that is being used by the Ikea lights).
To solve this “bug” the development team needs to “rewrite” this part in Homey, which needs a lot of development. Our first focus right now is to release version 2.0 of the Homey firmware and the new mobile app.
Once these are completed the development team will start working on resolving this “bug” as soon as possible.
I can understand that it is a bit frustrated that this issue is still occurring, but we promise that it is very high on our priority list to resolve this as soon as possible.
Best Regards,
Athom Support