Scenes not working

Hi everyone,

I have four Yeelight JIAOYUE YLXD04YL 450 ceiling lights in the living room. From time to time, their temperature or brightness of some of them changes for an unknown reason. I tried to create a workaround for this situation by creating a “Turn on with scene” for all of the four lights with the same temperature and brightness (ie. reset to the same setting) in the Yeelight app. However, the scene does not work - it does not even turn the lights on at all. I have tried several settings but to no avail. Is this a known problem?

Also, I have created two groups in the living room - two in the front part and and two in the back part of the room. Is there way to create a “supergroup” containing these two groups to be able to control all of the lights together if necessary?

The firmware version is 1.5.9_0040.

Many thanks.