Lamps got unavailable every couple of days!

So i just get my lamps back online. What is strange - during outage time i was not even able connect to the lamp after reset, mi home\yeelight application was seeing BT in lamp and that’s it - not connection were established. And then in one moment - boom…another one atempt and it get’s connected.

Is it possible that some kind of inteferance from WIFI networks prevention to connect via BT? I do tyr to get connected without BT, but there was not yeelink- network forund by iPhone8 as well as Xiaomi MiMax 2.

Any ideas? I have only one - get control board out of the lamps put regular ESP there and work with lamp in on\off mode…or maybe even with out ESP just 220v to LED Driver and thats it…

I’m little bit tired to fight with this …