Only yeelight bulbs are offline in yeelight app

I have got 4 yeelight white bulbs and 11 LED ceiling lights. I’ve got problems only with bulbs which get offline status after power shortage. All LED ceiling lights are ok with online status.

Funny thing is that all of those lights are online in home assistant (on raspberry pi) and I can control them. But bulbs in yeelight app are offline and because of that I can’t control them in google home. Why are they offline in yeelight app?

But if I restart router or access point they usually become online. Why problems only with LED bulbs and not with LED ceiling lights? Why problems only in yeelight app and not in home assistant?