Why does the Xiaomi Oscillation Electric Toothbrush switch modes abnormally or stop unexpectedly during switching?

If the Xiaomi Oscillation Electric Toothbrush switches modes abnormally or stops unexpectedly during switching, please refer to the following steps to troubleshoot:
1. Press the power button to turn on the Xiaomi Oscillation Electric Toothbrush. Within 10 seconds after turning on the toothbrush, press the button to cycle through modes.
2. If powered on for more than 10 seconds, pressing the power button will enter pause. After pausing or brushing, the toothbrush will turn off after 12 seconds of inactivity.
3. A lack of battery can cause the toothbrush to stop suddenly. Please fully charge the toothbrush and try again. If the issue persists, please contact the local after-sales service center for further assistance.