i have an iPad 4 which is in fantastic condition, I can't even tell it's old tbh. Anyway, I never had this occur before but I was listening to some music and suddenly this super loud screeching sound started coming out of my speakers. I was caught off guard by how loud it is, and had to turn off the app. I thought it was the app. I opened Spotify to try it out and the same happened. I opened Safari to Google it and it started again even though there was no source of audio on safari. i restarted and reseted my settings and it's all okay now. I'd like to know what that was though, I don't want to leave my iPad at home when I'm out and have that thing go off until it explodes or something. Anyone know what's wrong?