Several Offline Issues

Hi Yeelight Team,
I have 2 Ceeling Lights with the Yeelight App on the Singapore Server. Sometimes the Lights are going Offline. I can it reactivated with the Power Switch. Than 2 or 3 Days later the App Show me that my Lights are Offline again. And Amazon Echo says she can not found the Lights. So i bring it again online with the Power Switch. I have the latest Update 1.4.8_173. Can i have the new Firmware to resolve the Problem? . Other Bulbs, Lightstrips and a Desklamp will worked Perfectly but not the Ceeling Lights. I hope you can/will help me with this Problem.
Best Regards

Have added your account to firmware beta test, please try to update firmware 10mins later.