Why did the green code turn yellow after more than ten days of isolation? What happened to home isolation?

The sudden yellow code is because you have been to medium and high risk areas or have had contact with close contacts. If these two situations do not exist, most of the reasons are caused by space-time phenomena. For example, you have been to the same place with the confirmed patient within 14 days. Although there is no physical contact, due to the drift of communication signals, you will be defined as a space-time companion in the risk group through the system, and the health code will turn yellow. Home isolation means that some patients with infectious diseases need isolation treatment at home.