when music and video are played at a high volume, the speaker will be in a high volume state for a long time, which will increase the power consumption of the mobile phone speaker and bring extra power consumption and heat. This is a common phenomenon of power consumption and heat generation, so please don't worry. It is suggested that you appropriately turn down the volume of external playback or temporarily use headphones, and try to use loud external playback in an environment with good heat dissipation (such as indoor air conditioning environment).