Yeelight product become useless with unstable server connection

A lot of my Yeelight product all become not usable after a lot of lights go between offline and online within minutes.

This have cause a lot of automation failure seen on the automation logs. Created many topics and message to Yeelight staff went unreply. Very disappointed with Yeelight. I have over 20 lights and they are all useless now with unstable server connection.

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Problem solved. ISP router issue. Now all the device stay connected did not go offline.

After investigating, I found out that the ISP have route to a bad router to HK which have a lot of ICMP packet lost. ISP update their routing route to avoid the bad router and now the device stays online.