I am getting a very brief but loud chirp/squeak noise from the earpiece speaker on my 6S+ both when making and receiving calls. I hear the noise and then the call connects immediately afterwards. I'd say it happens the majority of the time, but occasionally, the keypad screen glitches/flashes and then the call connects without the noise. Bizarre. I've tried making/receiving calls with/without bluetooth, wifi, VoLTE, etc. enabled but nothing seems to make a difference. Anyone else experiencing something similar?