So I was calling my mom trying to FaceTime her. I was waiting for her to pick up as it was ringing. Yall know that sound it makes when you’re trying to FaceTime someone?? All of a sudden my iPhone sped up the sound and my phone got super loud. Idk how to describe it, but i even ended the call (she didn’t pick up) and the sound kept happening. It started to sound like feedback from a microphone or something. My phone started to vibrate with how loud it was and I tossed it out of my hand. It lasted about 10 seconds then it stopped. I restarted my phone and then called my mom. It’s hard for me to find any explanations for this and I haven’t seen anyone say something similar to this so idk what to do, im scared it’ll happen again. Not even my volume buttons would turn it down.