php editor Yuzai will answer for you: The volume button of Xiaomi mobile phone jumps by itself is a common problem, which may be caused by a system failure or hardware problem. First, you can try to restart your phone or update the system software to fix the problem. If the problem is still not resolved, it is recommended to contact Xiaomi official customer service or go to the after-sales service center for repairs in time to avoid affecting the daily use experience. Hope the above suggestions are helpful to you!
1. First, open the [Settings] function in the Xiaomi phone and click [Sound] on the settings page;
2. Then on the sound function page, click the [Press volume button to control by default] service;
3. Then a small window will pop up below, check the [Ringtone Volume] option;
4. Finally enter the page shown in the picture below, click [Press the volume keys for default control], and return to the mobile desktop to solve the problem.
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