Why does the volume of the Redmi Note 9 Pro automatically increase?

If the volume on your phone automatically increases, it can be a hardware or software problems.
If the volume of the Redmi Note 9 Pro automatically increases, please refer to the following details:
1. First, check if the button is stuck or has foreign objects. Try pressing the button several times to reset it, or clean the gap with alcohol cotton. If the button cannot be reset or has obvious dents, it can be hardware damaged;
2. If you’re using Bluetooth earphones, your phone will adjust the volume based on the connected device. Try disconnecting the connected device and see if the volume still changes on its own;
3. Some apps with media-playing functions will automatically start in the background and adjust the volume. If some newly installed apps are not compatible with the phone’s system, this can lead to abnormal volume adjustments. Try closing recently used apps or uninstalling newly installed apps to see if the problem is resolved;
4. Please boot your phone into Safe mode to rule out third-party apps that can be causing issues. You can turn off the phone first, then turn it on, and hold the power button until the phone vibrates while pressing the volume down button to enter Safe mode;
5. You can restart your phone. After the phone restarts, check if the problem still happens;
6. Ensure your phone is running the latest software version;
7. If the above methods do not work, please contact Xiaomi support or visit a service center for further assistance.