Thank you very much for your support of Xiaomi. I would like to sincerely apologize for bringing you a bad experience. If you encounter this phenomenon, please contact customer service personnel or go to the service outlet nearest you . This problem is because when the band is running software, there will be a very low probability of a software bug exception, causing the machine to run into an error state and enter protection mode (after-sales mode). Its hardware is normal. The new version has completely fixed this problem. Upgrading to the new version will not affect subsequent use and upgrades, and this problem will not occur again.