For your reference, the following situations can result in automatic volume adjustment:
1. When the earbuds are first connected to the MIUI device, its volume protection mechanism will make the volume adjust automatically;
2. When the earbuds are first connected to an iOS device, the device will automatically synchronize the volume level;
3. After adjusting the volume of the connected device, the volume will synchronize with the last set volume when reconnected;
4. The volume adaptive function has been turned on in the audio effects in the Xiaomi Earbuds APP of the MIUI system. After turning on this function, when playing music or watching videos, the media volume will increase in the presence of surrounding noise and decrease when restoring a quiet environment.