Yeelight LED Buld + Connection to Alexa - Never works!!!

I have to say this is the worst product i ever bought!

I have seen dozens of tutorials, tried dozens of times and the result is always the same.

I add yeelight to my app… then i add to MiHome… and then i add to Alexa… sometimes it works… sometimes it doesn’t work.
What happens 100% of the times, is the light stop working on the next day… with yeelight app… with MiHome app… and with Alexa app… they can’t detect the light anymore.

I tried different servers, always the same result. Currently i use:
Yeelight - China mainland
MiHome - China mainland
Alexa - EUA

I see here dozens of complaints about the same thing! Why can’t you fix this??