If no internet, ceiling light disconnect from wifi every few hours

After last firmware update, If no internet, ceiling lights disconnect from wifi every few hour and ble controls also not work.
Before disconnect the wifi, blink once, then go offline, but until it has internet, no issue…
Not available from lan, so no lancontrol, no nothing :confused:

I dont have always internet, so this things very anoying

FW: 2.0.6_0193
model: yeelink.light.ceiling1
mi id: 1609700321
regio: mainland china

Help pls