I have 2 Yeelight 480 lamps and one 650 lamp.
With last firmware, when light switched on and lamps reconnect to wifi they blinks once every time.
It’s very annoyng…
And, on previous firmware my lamps stay connected on wifi ap for at least 24 hours without reconnects. On last firmware they reconnects every 2-3 hours.
I have Xiaomi Phillips ceiling lamp too, it stay connected for 48 hours minimum, so it’s not a WiFi access point problem.