Why does my Android volume change by itself?
Short answer: it is usually not random. Headphone safety limits, per-device Bluetooth volume, a Do Not Disturb or bedtime schedule, or another app is changing it. Find which one, then save the levels you want so you can restore them in one tap.
1. Headphone safety limit
Phones warn you or lower media volume when headphones stay loud for a long time. If the volume drops only with earbuds in, this is the cause. Check your phone's sound settings for a media volume limit.
2. Bluetooth remembers its own level
Android keeps a separate media volume per output device. Connecting earbuds or a car can jump the volume to that device's last level.
3. Do Not Disturb, bedtime or routine schedules
A scheduled Do Not Disturb, bedtime mode or a phone routine can mute the ringer or notifications at set times. Look under Sound and Digital Wellbeing settings.
4. Another app is changing it
Video calls, navigation and some media apps change volume while running. If it happens only with one app open, that app is the cause.
5. Make the change visible
The fix that sticks is knowing what changed and when, and being able to put every level back at once.
Doing it with Volmode
Volmode saves media, ring, notification, alarm and call levels as modes. Today's switches show when and why each change it made happened, every scheduled switch has an Undo button, and one tap on a mode restores all five levels.
FAQ
Why does my volume drop back after I raise it with headphones?
Many Android phones apply a hearing-safety limit for headphones and lower media volume after a while or warn you at a certain level.
Why is my Bluetooth volume different from the speaker volume?
Android remembers media volume per output device, so earbuds, a car and the phone speaker can each have their own level.
How can I get my levels back quickly?
Save the levels you want as a mode so you can restore all of them with one tap instead of fixing each slider.