Rapidly inserting or removing earphones could cause the earphone connection to be incomplete or not fully recognized, leading to static noise. When you insert or remove the earphones too quickly, the phone's internal audio circuitry may not have enough time to properly recognize the change in the audio device, leading to static or popping noises. It is recommended to wait 3 seconds between removing and inserting the earphones to ensure proper connection and recognition. If static noise occurs, removing and reinserting the earphones will resolve it. This phenomenon is normal and is not a fault with the device. You can continue using your earphones with confidence, enjoying clear audio.