Alexa not working on yeelight

Hi,
I live in UK, every night from 9.30pm, our Alexa won’t connect to any of our yeelight lightstrip and our LED light bulbs. This is very frustrating and my wife rely on this light and she has to call me to ask me to connect it using the yeelight apps since Alexa say “Device is unresponsive” with Alexa for the past 7 nights. It works back in the morning and at night it just stop responding AGAIN.
Could anyone help me… I am getting frustrating on this, i am just regret getting this light.

Already reported here Yeelight not working with Alexa any more
Read the last three or four posts.