I added three zigbee bulbs to iobroker via zigbee adapter.

Then I assigned all three bulbs to a group.

Then I added yahka, linked the group with yahka. After a day or two, yahka stopped working.

I tried to change the state of the group directly in "objects", but the bulbs don't react at all.

Removing the bulbs, removing the group, then adding it all again doesn't work either.

Anyone any idea what is causing this?

Thanks!