While on a call, using the ear speakers, there was a sudden, extremely loud, piercing sound which caused me to shout in pain. The person on the other end of the call did not hear it. It stopped, then happened again about ten minutes later, the caller on the other end did not hear it but my husband heard it coming out of the ear speakers and he was sitting ten feet away from me. My phone was not plugged into a charger and I was not touching it. It was as though a surge created a high amplitude, high frequency noise. I'm afraid to use the earbuds again. ¿Qué está sucediendo?