If your Xiaomi 15 Ultra keeps switching sound modes on its own, it can be frustrating. One moment your phone is on sound, and the next it suddenly switches to vibrate or silent without warning. This usually happens because of system features, automation settings, or background apps that are allowed to control sound behavior.
Why Your Xiaomi 15 Ultra Sound Mode Keeps Changing
- Scheduled Silent or Do Not Disturb mode is enabled.
- Focus or automation features are controlling sound profiles.
- A third party app has permission to change sound settings.
- Bluetooth devices are forcing the phone into a different sound mode.
- A temporary system glitch is affecting audio behavior.
1. Check Do Not Disturb and Scheduled Silence
Do Not Disturb can automatically switch your phone to silent or vibrate based on time or events. If a schedule is active, your sound mode will change even if you did not manually enable it.
Open Settings, and then tap Sound and vibration.
Tap Do Not Disturb, and check if a schedule or automation is enabled.
Turn off schedules to prevent automatic sound changes.
2. Disable Sound Mode Automation Features
MIUI and HyperOS include automation tools that can adjust sound profiles based on location, time, or activity. These features are useful, but they can also cause unexpected sound changes.
Open Settings, and then tap Privacy and security.
Tap Special features, and check for Automation or Rules settings.
Disable any rule that controls sound or vibration modes.
3. Check App Permissions That Control Sound
Some apps, especially messaging, fitness, or system utility apps, can change sound modes silently. If one of them has special permissions, it may override your manual settings.
Open Settings, and then tap Apps.
Tap Permissions, and review apps with access to system controls or Do Not Disturb.
Remove permission from any app that does not need it.
4. Disconnect Bluetooth Devices
Certain Bluetooth devices like smartwatches or car systems can force your phone into silent or vibrate mode. This usually happens when the device reconnects automatically.
Open Settings, and then tap Bluetooth.
Turn off Bluetooth temporarily and observe if the issue stops.
If it does, remove the problematic device and pair it again.
5. Restart Your Phone
A restart refreshes background services that control sound behavior. It can quickly fix temporary bugs that cause sound modes to switch without user input.
Press and hold the Power key until the power menu appears.
Tap Restart, and wait for the device to boot fully.
Check if the sound mode remains stable afterward.
6. Update System Software
Software bugs can sometimes affect audio behavior, especially after major updates. Installing the latest system update often resolves these issues.
Open Settings, and then tap About phone.
Tap System update, and check for available updates.
Install any update and restart your phone after installation.
Once you disable automated sound controls and remove conflicting permissions, your Xiaomi 15 Ultra should stop changing sound modes on its own. These adjustments help keep your audio settings exactly how you want them.
FAQs
Why does my Xiaomi 15 Ultra switch to silent mode at night?
This usually happens because Do Not Disturb is scheduled. Turning off scheduled silence prevents automatic night time changes.
Can apps really change my phone’s sound mode?
Yes. Apps with special permissions can override sound settings, especially messaging or automation apps.
Does Bluetooth really affect sound mode changes?
Yes. Some connected devices automatically trigger silent or vibrate modes, especially car systems and wearables.
