Hello,
I have Alexa and Yeelight skill.
I got 2 yeelight bulb color (600 lumen) and 2 yeelight color bulb II (800 lumen).
I use it with Alexa, in the morning no problem but in evening I have no response from Yeelight.
I use German server ( I am italian).
Please can you fix the skill? It is buggy.
This is my log
Timestamp : 2019/12/07 23:20:36.690 UTC
mMessageId=b0fa59bd-75b2-462d-8c56-369cbbf8fe26
Yes I’ve the same problem!! 
I have the same problem. I live in UK. I use German server, i;ve tried Singapore server as well.
I use Alexa, work in the morning and don’t in the evening. My wife is laughing at me cos i am wasting money on this stuff. She ask me to use back the old method where u on and off using the old school method.
Change all your lights to the Mi Home app and they will all work again.
I don’t like Mi Home, I prefer Yeelight app.
I hope the team fix the issue connection problem.
In this evening Yeelight works perfectly.
I agree the Yeelight app is a lot better for these lights.
Alexa will not detect Yeelight bulb 2 with the Mi Home Skill. Only with Yeelight. How can we fix the issue ?
We have made some improvement on server side, if you still see the latency issue, please re-discover yeelight devices and try again.
Now works perfectly, thank you.