My cell phone volume turns down by itself

the volume of my cell phone turns down by itself
the volume of my cell phone turns up by itself
the volume of my cell phone is lowered only Xiaomi
the volume of my cell phone goes up only Xiaomi
Why does my cell phone volume turn down by itself?
why does the volume of my cell phone go down only Xiaomi
Xiaomi turns up the volume on its own
how to fix the volume on my cell phone that turns down by itself
how to fix the volume on my cell phone that goes up by itself