Why can't the Xiaomi Smart Band 9 be found during searching when attempting to rebind after unbinding?

The Bluetooth connection between the band and the phone encounters disruptions or inconsistencies, making the band temporarily undetectable.
For your reference, here are two resolutions for this issue as follows:
1. Manually toggling the Bluetooth switch on the phone's system settings can help reset the Bluetooth connection and clear any existing connection errors or conflicts;
2. Restarting both the Xiaomi Smart Band 9 and the phone can also resolve connectivity issues by refreshing their operating states and allowing them to reconnect properly.