I listen to music on max volume through from my phone not through headphones, why does sound automatically go down itself? decrease from full sound to 75% after 10min while 10min plays on max sound from phone speakers. Well, do you know the limit when the headphones are plugged in so that the hearing can understand - or do you increase the volume to the maximum. Could it be that the phone itself senses that it is too loud? Because when I hold my arms on the bottom a little warm near the speaker. I hear for the first time that the speaker reduces the volume due to the heat, not the first time I have encountered this. why turning down volume itself???