Thank you - around 3AM I’m rebooting my router each day - yet the connection always when tested it’s fine in the original Yeelights app. Also no other devices (non-Yeeligght yet Wifi devices) have this problem at my home yet Yeelights seems not to be able to reconnect.
Not sure what happened at 4:51 however. It looks to me it gave up and refuse to reconnect after while anymore.