The signal quality is not good. If the Wi-Fi signal quality itself is not good, or the distance is too far, it will cause the WiFi of the Xiaomi watch to break the link and not connect, you can also check to see if the software version is updated.
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1. Slide into the Control Center on the watch screen, tap Settings, and then tap wlan Settings.
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2. Turn on the wlan switch, click the network you want to connect to, and enter the password.
In order to optimize the battery life of the watch, the watch system will give priority to Bluetooth for data transmission. That is; When the watch is connected to Wi-F I and Bluetooth at the same time, Bluetooth is preferred.