My iPhone XS Max has a strange crackling sound in the earphone the first 3-4 seconds when making an outgoing call. It only happens when there is a tone on the other side (and only during the first tone), never if a voice kicks in at once without a tone (like when calling voice mail). It also happens when a headphone is connected, which makes me think it’s a software problem. It happens at every outgoing call, never any incoming call. Has any one else seen a similar problem? I don’t want to go through the trouble of exchanging the phone if it’s a software problem like it was on the 8 and 8 plus last year. Thanks for any input.