Software

[Yoej]

Since the June security update my phone (A52s) will sometimes lower its volume automaticlly this happen several time now. 

[Khaled75]

Try restarting your phone.

[Khaled75]

Did it work?

[Yoej]

Already restart my phone

[Yoej]

It's still happening

[Khaled75]

Try going into Safe mode.

[Yoej]

What is safe mode?

[Khaled75]

Safe mode disables third party apps that causes issues. To go into Safe mode with the device powered on:
1. Press and hold the power button.
2. Tap and hold Power off.
3. Tap Safe mode.

To go into Safe mode with the device powered off:
1. Press and hold the power button.
2. When "Samsung Galaxy powered by Android" shows, release the power button.
3. When the Samsung or Samsung Galaxy logo appears, press and hold the volume down button. Keep holding the volume down button until the lock screen appears.
4. If you did it correctly, "Safe mode" will appear on the bottom left of your screen.

[Yoej]

Thanks but I think this is not third party apps I havent install any new apps on my phone.

[Khaled75]

Did Safe mode work?