Part of my Yeelight bulbs all of a sudden are offline

I have around 30 Yeelight bulbs in my home. I have used them for a while, however all of a sudden some of my Yeelights are offline.

I have tried to powercycle a number of times , I have tried rebooting my router (Eero Pro mesh routers), but nothing really helps. I probably have half of my bulbs currently offline.

All are updated with latest firmware on my account jesper@sachmanns.dk

Really frustrating and not impressing the family with the choice of predominantly Yeelight bulbs in my home.